72581507328 has 108 divisors (see below), whose sum is σ = 212330548304. Its totient is φ = 21994368000.

The previous prime is 72581507309. The next prime is 72581507329. The reversal of 72581507328 is 82370518527.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (72581507329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297598 + ... + 483453.

Almost surely, 2^72581507328 is an apocalyptic number.

It is an amenable number.

72581507328 is an abundant number, since it is smaller than the sum of its proper divisors (139749040976).

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

72581507328 is a wasteful number, since it uses less digits than its factorization.

72581507328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781092 (or 781067 counting only the distinct ones).

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

The spelling of 72581507328 in words is "seventy-two billion, five hundred eighty-one million, five hundred seven thousand, three hundred twenty-eight".