78572865 has 32 divisors (see below), whose sum is σ = 144138240. Its totient is φ = 35803584.

The previous prime is 78572831. The next prime is 78572869. The reversal of 78572865 is 56827587.

It is not a de Polignac number, because 78572865 - 2⁶ = 78572801 is a prime.

It is a super-2 number, since 2×78572865² = 12347390228616450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78572869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37516 + ... + 39554.

It is an arithmetic number, because the mean of its divisors is an integer number (4504320).

Almost surely, 2^78572865 is an apocalyptic number.

It is an amenable number.

78572865 is a deficient number, since it is larger than the sum of its proper divisors (65565375).

78572865 is a wasteful number, since it uses less digits than its factorization.

78572865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421.

The product of its digits is 940800, while the sum is 48.

The square root of 78572865 is about 8864.1336294079. The cubic root of 78572865 is about 428.3093248953.

The spelling of 78572865 in words is "seventy-eight million, five hundred seventy-two thousand, eight hundred sixty-five".