74640561 has 8 divisors (see below), whose sum is σ = 101835360. Its totient is φ = 48603072.

The previous prime is 74640539. The next prime is 74640571. The reversal of 74640561 is 16504647.

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

It is a de Polignac number, because none of the positive numbers 2^k-74640561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74640521) 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, 289176 + ... + 289433.

It is an arithmetic number, because the mean of its divisors is an integer number (12729420).

Almost surely, 2^74640561 is an apocalyptic number.

It is an amenable number.

74640561 is a deficient number, since it is larger than the sum of its proper divisors (27194799).

74640561 is a wasteful number, since it uses less digits than its factorization.

74640561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578655.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 74640561 is about 8639.4768938866. The cubic root of 74640561 is about 421.0415588917.

The spelling of 74640561 in words is "seventy-four million, six hundred forty thousand, five hundred sixty-one".