16624404 has 36 divisors (see below), whose sum is σ = 42820596. Its totient is φ = 5436288.

The previous prime is 16624397. The next prime is 16624409. The reversal of 16624404 is 40442661.

It can be written as a sum of positive squares in 2 ways, for example, as 14516100 + 2108304 = 3810^2 + 1452^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16624409) 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, 2449 + ... + 6264.

It is an arithmetic number, because the mean of its divisors is an integer number (1189461).

Almost surely, 2^16624404 is an apocalyptic number.

It is an amenable number.

16624404 is an abundant number, since it is smaller than the sum of its proper divisors (26196192).

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

16624404 is a wasteful number, since it uses less digits than its factorization.

16624404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776 (or 8771 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 16624404 is about 4077.3035207107. The cubic root of 16624404 is about 255.2203861755.

The spelling of 16624404 in words is "sixteen million, six hundred twenty-four thousand, four hundred four".