18640464 has 40 divisors (see below), whose sum is σ = 48365952. Its totient is φ = 6186240.

The previous prime is 18640451. The next prime is 18640469. The reversal of 18640464 is 46404681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12292 + ... + 13724.

Almost surely, 2^18640464 is an apocalyptic number.

It is an amenable number.

18640464 is an abundant number, since it is smaller than the sum of its proper divisors (29725488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18640464 is a wasteful number, since it uses less digits than its factorization.

18640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 18640464 is about 4317.4603646125. The cubic root of 18640464 is about 265.1463010831.

The spelling of 18640464 in words is "eighteen million, six hundred forty thousand, four hundred sixty-four".