74660561 has 8 divisors (see below), whose sum is σ = 76876584. Its totient is φ = 72455040.

The previous prime is 74660543. The next prime is 74660567. The reversal of 74660561 is 16506647.

It can be written as a sum of positive squares in 4 ways, for example, as 15062161 + 59598400 = 3881^2 + 7720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74660561 - 2⁶ = 74660497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74660567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13181 + ... + 17973.

It is an arithmetic number, because the mean of its divisors is an integer number (9609573).

Almost surely, 2^74660561 is an apocalyptic number.

It is an amenable number.

74660561 is a deficient number, since it is larger than the sum of its proper divisors (2216023).

74660561 is a wasteful number, since it uses less digits than its factorization.

74660561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 74660561 is about 8640.6342938467. The cubic root of 74660561 is about 421.0791616778.

The spelling of 74660561 in words is "seventy-four million, six hundred sixty thousand, five hundred sixty-one".