72911900 has 36 divisors (see below), whose sum is σ = 159807480. Its totient is φ = 28872000.

The previous prime is 72911821. The next prime is 72911921. The reversal of 72911900 is 911927.

It is a super-2 number, since 2×72911900² = 10632290323220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6491 + ... + 13709.

Almost surely, 2^72911900 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 72911900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79903740).

72911900 is an abundant number, since it is smaller than the sum of its proper divisors (86895580).

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

72911900 is a wasteful number, since it uses less digits than its factorization.

72911900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334 (or 7327 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 72911900 is about 8538.8465263172. The cubic root of 72911900 is about 417.7657242029.

The spelling of 72911900 in words is "seventy-two million, nine hundred eleven thousand, nine hundred".