72313977 has 4 divisors (see below), whose sum is σ = 96418640. Its totient is φ = 48209316.

The previous prime is 72313957. The next prime is 72313987. The reversal of 72313977 is 77931327.

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: 77931327 = 3 ⋅25977109.

It is not a de Polignac number, because 72313977 - 2⁸ = 72313721 is a prime.

It is a super-2 number, since 2×72313977² = 10458622539113058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72313957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12052327 + ... + 12052332.

It is an arithmetic number, because the mean of its divisors is an integer number (24104660).

Almost surely, 2^72313977 is an apocalyptic number.

It is an amenable number.

72313977 is a deficient number, since it is larger than the sum of its proper divisors (24104663).

72313977 is a wasteful number, since it uses less digits than its factorization.

72313977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24104662.

The product of its digits is 55566, while the sum is 39.

The square root of 72313977 is about 8503.7625202025. The cubic root of 72313977 is about 416.6206085267.

The spelling of 72313977 in words is "seventy-two million, three hundred thirteen thousand, nine hundred seventy-seven".