72570636 has 18 divisors (see below), whose sum is σ = 183442532. Its totient is φ = 24190200.

The previous prime is 72570629. The next prime is 72570661. The reversal of 72570636 is 63607527.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2015851 = 72570636 / (7 + 2 + 5 + 7 + 0 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 72570636.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007890 + ... + 1007961.

Almost surely, 2^72570636 is an apocalyptic number.

It is an amenable number.

72570636 is an abundant number, since it is smaller than the sum of its proper divisors (110871896).

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

72570636 is a wasteful number, since it uses less digits than its factorization.

72570636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015861 (or 2015856 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 72570636 is about 8518.8400618864. The cubic root of 72570636 is about 417.1129207846.

The spelling of 72570636 in words is "seventy-two million, five hundred seventy thousand, six hundred thirty-six".