72515545520 has 160 divisors (see below), whose sum is σ = 187761893184. Its totient is φ = 25821286400.

The previous prime is 72515545507. The next prime is 72515545541. The reversal of 72515545520 is 2554551527.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30454730 + ... + 30457110.

Almost surely, 2^72515545520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72515545520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93880946592).

72515545520 is an abundant number, since it is smaller than the sum of its proper divisors (115246347664).

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

72515545520 is a wasteful number, since it uses less digits than its factorization.

72515545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111 (or 3105 counting only the distinct ones).

The product of its (nonzero) digits is 350000, while the sum is 41.

The spelling of 72515545520 in words is "seventy-two billion, five hundred fifteen million, five hundred forty-five thousand, five hundred twenty".