40644556 has 12 divisors (see below), whose sum is σ = 71486800. Its totient is φ = 20219760.

The previous prime is 40644551. The next prime is 40644557. The reversal of 40644556 is 65544604.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (40644551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24735 + ... + 26326.

Almost surely, 2^40644556 is an apocalyptic number.

It is an amenable number.

40644556 is a deficient number, since it is larger than the sum of its proper divisors (30842244).

40644556 is a wasteful number, since it uses less digits than its factorization.

40644556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51264 (or 51262 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 40644556 is about 6375.3083062704. The cubic root of 40644556 is about 343.8223686312.

The spelling of 40644556 in words is "forty million, six hundred forty-four thousand, five hundred fifty-six".