72208090 has 16 divisors (see below), whose sum is σ = 133488072. Its totient is φ = 28102464.

The previous prime is 72208067. The next prime is 72208141. The reversal of 72208090 is 9080227.

It can be written as a sum of positive squares in 4 ways, for example, as 71520849 + 687241 = 8457^2 + 829^2 .

It is a super-2 number, since 2×72208090² = 10428016522896200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97209 + ... + 97948.

Almost surely, 2^72208090 is an apocalyptic number.

72208090 is a deficient number, since it is larger than the sum of its proper divisors (61279982).

72208090 is a wasteful number, since it uses less digits than its factorization.

72208090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195201.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 72208090 is about 8497.5343482683. The cubic root of 72208090 is about 416.4171612005.

The spelling of 72208090 in words is "seventy-two million, two hundred eight thousand, ninety".