74406581 has 8 divisors (see below), whose sum is σ = 75576600. Its totient is φ = 73244160.

The previous prime is 74406571. The next prime is 74406583. The reversal of 74406581 is 18560447.

It can be written as a sum of positive squares in 4 ways, for example, as 188356 + 74218225 = 434^2 + 8615^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74406581 is a prime.

It is a super-2 number, since 2×74406581² = 11072678592219122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74406583) 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, 19715 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (9447075).

Almost surely, 2^74406581 is an apocalyptic number.

It is an amenable number.

74406581 is a deficient number, since it is larger than the sum of its proper divisors (1170019).

74406581 is a wasteful number, since it uses less digits than its factorization.

74406581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 74406581 is about 8625.9249359127. The cubic root of 74406581 is about 420.6011440878.

The spelling of 74406581 in words is "seventy-four million, four hundred six thousand, five hundred eighty-one".