72708577 has 4 divisors (see below), whose sum is σ = 74255616. Its totient is φ = 71161540.

The previous prime is 72708557. The next prime is 72708593. The reversal of 72708577 is 77580727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77580727 = 7 ⋅11082961.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72708577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72708557) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 773449 + ... + 773542.

It is an arithmetic number, because the mean of its divisors is an integer number (18563904).

Almost surely, 2^72708577 is an apocalyptic number.

It is an amenable number.

72708577 is a deficient number, since it is larger than the sum of its proper divisors (1547039).

72708577 is a wasteful number, since it uses less digits than its factorization.

72708577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547038.

The product of its (nonzero) digits is 192080, while the sum is 43.

The square root of 72708577 is about 8526.9324495976. The cubic root of 72708577 is about 417.3770338379.

The spelling of 72708577 in words is "seventy-two million, seven hundred eight thousand, five hundred seventy-seven".