72656739 has 6 divisors (see below), whose sum is σ = 104948636. Its totient is φ = 48437820.

The previous prime is 72656737. The next prime is 72656767. The reversal of 72656739 is 93765627.

It is not a de Polignac number, because 72656739 - 2¹ = 72656737 is a prime.

It is a super-2 number, since 2×72656739² = 10558003444228242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72656694 and 72656703.

It is not an unprimeable number, because it can be changed into a prime (72656737) 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 5 ways as a sum of consecutive naturals, for example, 4036477 + ... + 4036494.

Almost surely, 2^72656739 is an apocalyptic number.

72656739 is a deficient number, since it is larger than the sum of its proper divisors (32291897).

72656739 is a wasteful number, since it uses less digits than its factorization.

72656739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8072977 (or 8072974 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 72656739 is about 8523.8922447436. The cubic root of 72656739 is about 417.2778197999.

The spelling of 72656739 in words is "seventy-two million, six hundred fifty-six thousand, seven hundred thirty-nine".