1872620820 has 144 divisors (see below), whose sum is σ = 6581003520. Its totient is φ = 422143488.

The previous prime is 1872620779. The next prime is 1872620821. The reversal of 1872620820 is 280262781.

It is a happy number.

1872620820 is a `hidden beast` number, since 1 + 8 + 7 + 2 + 620 + 8 + 20 = 666.

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 (1872620821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81801 + ... + 102159.

Almost surely, 2^1872620820 is an apocalyptic number.

1872620820 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 1872620820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3290501760).

1872620820 is an abundant number, since it is smaller than the sum of its proper divisors (4708382700).

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

1872620820 is a wasteful number, since it uses less digits than its factorization.

1872620820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20454 (or 20449 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1872620820 is about 43273.7890645134. The cubic root of 1872620820 is about 1232.5842553013.

The spelling of 1872620820 in words is "one billion, eight hundred seventy-two million, six hundred twenty thousand, eight hundred twenty".