72640434 has 24 divisors (see below), whose sum is σ = 146769840. Its totient is φ = 23967792.

The previous prime is 72640429. The next prime is 72640453. The reversal of 72640434 is 43404627.

It is a Curzon number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 70777 + ... + 71795.

It is an arithmetic number, because the mean of its divisors is an integer number (6115410).

Almost surely, 2^72640434 is an apocalyptic number.

72640434 is an abundant number, since it is smaller than the sum of its proper divisors (74129406).

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

72640434 is a wasteful number, since it uses less digits than its factorization.

72640434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 72640434 is about 8522.9357618135. The cubic root of 72640434 is about 417.2466034991.

The spelling of 72640434 in words is "seventy-two million, six hundred forty thousand, four hundred thirty-four".