72207956 has 6 divisors (see below), whose sum is σ = 126363930. Its totient is φ = 36103976.

The previous prime is 72207953. The next prime is 72207973. The reversal of 72207956 is 65970227.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 21939856 = 7090^2 + 4684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72207953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9025991 + ... + 9025998.

It is an arithmetic number, because the mean of its divisors is an integer number (21060655).

Almost surely, 2^72207956 is an apocalyptic number.

It is an amenable number.

72207956 is a deficient number, since it is larger than the sum of its proper divisors (54155974).

72207956 is a wasteful number, since it uses less digits than its factorization.

72207956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18051993 (or 18051991 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 72207956 is about 8497.5264636246. The cubic root of 72207956 is about 416.4169036119.

The spelling of 72207956 in words is "seventy-two million, two hundred seven thousand, nine hundred fifty-six".