16631604 has 36 divisors (see below), whose sum is σ = 45864000. Its totient is φ = 5039760.

The previous prime is 16631603. The next prime is 16631621. The reversal of 16631604 is 40613661.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×16631604² = 553220503225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20604 + ... + 21395.

It is an arithmetic number, because the mean of its divisors is an integer number (1274000).

Almost surely, 2^16631604 is an apocalyptic number.

It is an amenable number.

16631604 is an abundant number, since it is smaller than the sum of its proper divisors (29232396).

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

16631604 is a wasteful number, since it uses less digits than its factorization.

16631604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42020 (or 42015 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16631604 is about 4078.1863616073. The cubic root of 16631604 is about 255.2572260237.

The spelling of 16631604 in words is "sixteen million, six hundred thirty-one thousand, six hundred four".