72156680 has 64 divisors (see below), whose sum is σ = 172022400. Its totient is φ = 27239616.

The previous prime is 72156659. The next prime is 72156713. The reversal of 72156680 is 8665127.

It is a self number, because there is not a number n which added to its sum of digits gives 72156680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274229 + ... + 274491.

It is an arithmetic number, because the mean of its divisors is an integer number (2687850).

Almost surely, 2^72156680 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 72156680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86011200).

72156680 is an abundant number, since it is smaller than the sum of its proper divisors (99865720).

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

72156680 is a wasteful number, since it uses less digits than its factorization.

72156680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 72156680 is about 8494.5088145225. The cubic root of 72156680 is about 416.3183122170.

The spelling of 72156680 in words is "seventy-two million, one hundred fifty-six thousand, six hundred eighty".