72775913 has 4 divisors (see below), whose sum is σ = 83172480. Its totient is φ = 62379348.

The previous prime is 72775897. The next prime is 72775931. The reversal of 72775913 is 31957727.

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: 31957727 = 67 ⋅476981.

It is a cyclic number.

It is not a de Polignac number, because 72775913 - 2⁴ = 72775897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72775613) 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, 5198273 + ... + 5198286.

It is an arithmetic number, because the mean of its divisors is an integer number (20793120).

Almost surely, 2^72775913 is an apocalyptic number.

It is an amenable number.

72775913 is a deficient number, since it is larger than the sum of its proper divisors (10396567).

72775913 is a wasteful number, since it uses less digits than its factorization.

72775913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10396566.

The product of its digits is 92610, while the sum is 41.

The square root of 72775913 is about 8530.8799663341. The cubic root of 72775913 is about 417.5058394967.

The spelling of 72775913 in words is "seventy-two million, seven hundred seventy-five thousand, nine hundred thirteen".