18951664 has 40 divisors (see below), whose sum is σ = 39918080. Its totient is φ = 8683200.

The previous prime is 18951649. The next prime is 18951671. The reversal of 18951664 is 46615981.

It is a congruent number.

It is an unprimeable number.

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, 8419 + ... + 10429.

It is an arithmetic number, because the mean of its divisors is an integer number (997952).

Almost surely, 2^18951664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18951664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19959040).

18951664 is an abundant number, since it is smaller than the sum of its proper divisors (20966416).

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

18951664 is a wasteful number, since it uses less digits than its factorization.

18951664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069 (or 2063 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 18951664 is about 4353.3508932775. The cubic root of 18951664 is about 266.6136922549.

The spelling of 18951664 in words is "eighteen million, nine hundred fifty-one thousand, six hundred sixty-four".