1565904072 has 16 divisors (see below), whose sum is σ = 3914760240. Its totient is φ = 521968016.

The previous prime is 1565904071. The next prime is 1565904091. The reversal of 1565904072 is 2704095651.

It is a self number, because there is not a number n which added to its sum of digits gives 1565904072.

It is not an unprimeable number, because it can be changed into a prime (1565904071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32622978 + ... + 32623025.

It is an arithmetic number, because the mean of its divisors is an integer number (244672515).

Almost surely, 2^1565904072 is an apocalyptic number.

1565904072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1565904072 is an abundant number, since it is smaller than the sum of its proper divisors (2348856168).

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

1565904072 is a wasteful number, since it uses less digits than its factorization.

1565904072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65246012 (or 65246008 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 1565904072 is about 39571.5058091046. The cubic root of 1565904072 is about 1161.2392799893.

The spelling of 1565904072 in words is "one billion, five hundred sixty-five million, nine hundred four thousand, seventy-two".