16664520 has 64 divisors (see below), whose sum is σ = 52632000. Its totient is φ = 4209408.

The previous prime is 16664519. The next prime is 16664551. The reversal of 16664520 is 2546661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375 + ... + 5934.

It is an arithmetic number, because the mean of its divisors is an integer number (822375).

Almost surely, 2^16664520 is an apocalyptic number.

16664520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16664520 is an abundant number, since it is smaller than the sum of its proper divisors (35967480).

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

16664520 is a wasteful number, since it uses less digits than its factorization.

16664520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7342 (or 7338 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 16664520 is about 4082.2199842733. The cubic root of 16664520 is about 255.4255102542.

The spelling of 16664520 in words is "sixteen million, six hundred sixty-four thousand, five hundred twenty".