18640756 has 6 divisors (see below), whose sum is σ = 32621330. Its totient is φ = 9320376.

The previous prime is 18640753. The next prime is 18640757. The reversal of 18640756 is 65704681.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 6502500 = 3484^2 + 2550^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330091 + ... + 2330098.

Almost surely, 2^18640756 is an apocalyptic number.

It is an amenable number.

18640756 is a deficient number, since it is larger than the sum of its proper divisors (13980574).

18640756 is a wasteful number, since it uses less digits than its factorization.

18640756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660193 (or 4660191 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 18640756 is about 4317.4941806562. The cubic root of 18640756 is about 265.1476855679.

The spelling of 18640756 in words is "eighteen million, six hundred forty thousand, seven hundred fifty-six".