72431994 has 16 divisors (see below), whose sum is σ = 148397760. Its totient is φ = 23555040.

The previous prime is 72431963. The next prime is 72432001. The reversal of 72431994 is 49913427.

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 7 ways as a sum of consecutive naturals, for example, 146974 + ... + 147465.

It is an arithmetic number, because the mean of its divisors is an integer number (9274860).

Almost surely, 2^72431994 is an apocalyptic number.

72431994 is an abundant number, since it is smaller than the sum of its proper divisors (75965766).

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

72431994 is a wasteful number, since it uses less digits than its factorization.

72431994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294485.

The product of its digits is 54432, while the sum is 39.

The square root of 72431994 is about 8510.6987962211. The cubic root of 72431994 is about 416.8471280873.

The spelling of 72431994 in words is "seventy-two million, four hundred thirty-one thousand, nine hundred ninety-four".