72991234 has 16 divisors (see below), whose sum is σ = 118757016. Its totient is φ = 33510400.

The previous prime is 72991199. The next prime is 72991241. The reversal of 72991234 is 43219927.

It can be written as a sum of positive squares in 4 ways, for example, as 35964009 + 37027225 = 5997^2 + 6085^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72991193 and 72991202.

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, 24787 + ... + 27574.

Almost surely, 2^72991234 is an apocalyptic number.

72991234 is a deficient number, since it is larger than the sum of its proper divisors (45765782).

72991234 is a wasteful number, since it uses less digits than its factorization.

72991234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52421.

The product of its digits is 27216, while the sum is 37.

The square root of 72991234 is about 8543.4907385682. The cubic root of 72991234 is about 417.9171901614.

The spelling of 72991234 in words is "seventy-two million, nine hundred ninety-one thousand, two hundred thirty-four".