74772561 has 12 divisors (see below), whose sum is σ = 102194576. Its totient is φ = 48629280.

The previous prime is 74772553. The next prime is 74772587. The reversal of 74772561 is 16527747.

It is not a de Polignac number, because 74772561 - 2³ = 74772553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74772661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2371 + ... + 12456.

Almost surely, 2^74772561 is an apocalyptic number.

It is an amenable number.

74772561 is a deficient number, since it is larger than the sum of its proper divisors (27422015).

74772561 is a wasteful number, since it uses less digits than its factorization.

74772561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14912 (or 14871 counting only the distinct ones).

The product of its digits is 82320, while the sum is 39.

The square root of 74772561 is about 8647.1128707795. The cubic root of 74772561 is about 421.2896132770.

The spelling of 74772561 in words is "seventy-four million, seven hundred seventy-two thousand, five hundred sixty-one".