74440561 has 8 divisors (see below), whose sum is σ = 80262504. Its totient is φ = 68632320.

The previous prime is 74440547. The next prime is 74440571. The reversal of 74440561 is 16504447.

It can be written as a sum of positive squares in 4 ways, for example, as 13366336 + 61074225 = 3656^2 + 7815^2 .

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 74440561 - 2⁵ = 74440529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74440511) 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, 9771 + ... + 15631.

It is an arithmetic number, because the mean of its divisors is an integer number (10032813).

Almost surely, 2^74440561 is an apocalyptic number.

It is an amenable number.

74440561 is a deficient number, since it is larger than the sum of its proper divisors (5821943).

74440561 is a wasteful number, since it uses less digits than its factorization.

74440561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 74440561 is about 8627.8943549397. The cubic root of 74440561 is about 420.6651610587.

The spelling of 74440561 in words is "seventy-four million, four hundred forty thousand, five hundred sixty-one".