72639394 has 16 divisors (see below), whose sum is σ = 116150400. Its totient is φ = 33971184.

The previous prime is 72639379. The next prime is 72639407. The reversal of 72639394 is 49393627.

It is a self number, because there is not a number n which added to its sum of digits gives 72639394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9097 + ... + 15100.

It is an arithmetic number, because the mean of its divisors is an integer number (7259400).

Almost surely, 2^72639394 is an apocalyptic number.

72639394 is a deficient number, since it is larger than the sum of its proper divisors (43511006).

72639394 is a wasteful number, since it uses less digits than its factorization.

72639394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24297.

The product of its digits is 244944, while the sum is 43.

The square root of 72639394 is about 8522.8747497543. The cubic root of 72639394 is about 417.2446122365.

The spelling of 72639394 in words is "seventy-two million, six hundred thirty-nine thousand, three hundred ninety-four".