1065621520 has 80 divisors (see below), whose sum is σ = 2534837760. Its totient is φ = 416512512.

The previous prime is 1065621509. The next prime is 1065621521. The reversal of 1065621520 is 251265601.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1065621520² = 2271098447774220800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1065621521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650142 + ... + 651778.

It is an arithmetic number, because the mean of its divisors is an integer number (31685472).

Almost surely, 2^1065621520 is an apocalyptic number.

1065621520 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 1065621520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1267418880).

1065621520 is an abundant number, since it is smaller than the sum of its proper divisors (1469216240).

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

1065621520 is a wasteful number, since it uses less digits than its factorization.

1065621520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1826 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1065621520 is about 32643.8588405231. The cubic root of 1065621520 is about 1021.4120900773.

The spelling of 1065621520 in words is "one billion, sixty-five million, six hundred twenty-one thousand, five hundred twenty".