74115561 has 32 divisors (see below), whose sum is σ = 115920000. Its totient is φ = 41707008.

The previous prime is 74115557. The next prime is 74115581. The reversal of 74115561 is 16551147.

It is not a de Polignac number, because 74115561 - 2² = 74115557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74115511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19765 + ... + 23213.

It is an arithmetic number, because the mean of its divisors is an integer number (3622500).

Almost surely, 2^74115561 is an apocalyptic number.

It is an amenable number.

74115561 is a deficient number, since it is larger than the sum of its proper divisors (41804439).

74115561 is a wasteful number, since it uses less digits than its factorization.

74115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513.

The product of its digits is 4200, while the sum is 30.

The square root of 74115561 is about 8609.0394934627. The cubic root of 74115561 is about 420.0520740422.

The spelling of 74115561 in words is "seventy-four million, one hundred fifteen thousand, five hundred sixty-one".