72597243640 has 64 divisors (see below), whose sum is σ = 172402480800. Its totient is φ = 27436672512.

The previous prime is 72597243623. The next prime is 72597243647. The reversal of 72597243640 is 4634279527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72597243647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155434 + ... + 411526.

Almost surely, 2^72597243640 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 72597243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86201240400).

72597243640 is an abundant number, since it is smaller than the sum of its proper divisors (99805237160).

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

72597243640 is a wasteful number, since it uses less digits than its factorization.

72597243640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256496 (or 256492 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 72597243640 in words is "seventy-two billion, five hundred ninety-seven million, two hundred forty-three thousand, six hundred forty".