72072090 has 24 divisors (see below), whose sum is σ = 187387668. Its totient is φ = 19219200.

The previous prime is 72072089. The next prime is 72072107. The reversal of 72072090 is 9027027.

It can be written as a sum of positive squares in 2 ways, for example, as 70610409 + 1461681 = 8403^2 + 1209^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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, 400311 + ... + 400490.

Almost surely, 2^72072090 is an apocalyptic number.

72072090 is an abundant number, since it is smaller than the sum of its proper divisors (115315578).

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

72072090 is a wasteful number, since it uses less digits than its factorization.

72072090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800814 (or 800811 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 72072090 is about 8489.5282554451. The cubic root of 72072090 is about 416.1555638916.

The spelling of 72072090 in words is "seventy-two million, seventy-two thousand, ninety".