72157900 has 72 divisors (see below), whose sum is σ = 165301920. Its totient is φ = 27287040.

The previous prime is 72157873. The next prime is 72157901. The reversal of 72157900 is 975127.

It is not an unprimeable number, because it can be changed into a prime (72157901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 314986 + ... + 315214.

It is an arithmetic number, because the mean of its divisors is an integer number (2295860).

Almost surely, 2^72157900 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 72157900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82650960).

72157900 is an abundant number, since it is smaller than the sum of its proper divisors (93144020).

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

72157900 is a wasteful number, since it uses less digits than its factorization.

72157900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 72157900 is about 8494.5806253164. The cubic root of 72157900 is about 416.3206585254.

The spelling of 72157900 in words is "seventy-two million, one hundred fifty-seven thousand, nine hundred".