1572217920 has 504 divisors, whose sum is σ = 6782479704. Its totient is φ = 331333632.

The previous prime is 1572217903. The next prime is 1572217921. The reversal of 1572217920 is 297122751.

1572217920 = T₄₅₆ + T₄₅₇ + ... + T₂₁₁₉.

It can be written as a sum of positive squares in 4 ways, for example, as 218566656 + 1353651264 = 14784^2 + 36792^2 .

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1572217921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1834132 + ... + 1834988.

It is an arithmetic number, because the mean of its divisors is an integer number (13457301).

Almost surely, 2^1572217920 is an apocalyptic number.

1572217920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1572217920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3391239852).

1572217920 is an abundant number, since it is smaller than the sum of its proper divisors (5210261784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1572217920 is a wasteful number, since it uses less digits than its factorization.

1572217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 1572217920 is about 39651.2032604308. The cubic root of 1572217920 is about 1162.7979229487.

The spelling of 1572217920 in words is "one billion, five hundred seventy-two million, two hundred seventeen thousand, nine hundred twenty".