72304639 has 6 divisors (see below), whose sum is σ = 79475480. Its totient is φ = 65731380.

The previous prime is 72304577. The next prime is 72304643. The reversal of 72304639 is 93640327.

It is not a de Polignac number, because 72304639 - 2¹³ = 72296447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72304699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298659 + ... + 298900.

Almost surely, 2^72304639 is an apocalyptic number.

72304639 is a deficient number, since it is larger than the sum of its proper divisors (7170841).

72304639 is a wasteful number, since it uses less digits than its factorization.

72304639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597581 (or 597570 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 72304639 is about 8503.2134513959. The cubic root of 72304639 is about 416.6026748304.

The spelling of 72304639 in words is "seventy-two million, three hundred four thousand, six hundred thirty-nine".