16640724 has 24 divisors (see below), whose sum is σ = 38894688. Its totient is φ = 5537440.

The previous prime is 16640681. The next prime is 16640731. The reversal of 16640724 is 42704661.

It is a junction number, because it is equal to n+sod(n) for n = 16640691 and 16640700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12079 + ... + 13385.

It is an arithmetic number, because the mean of its divisors is an integer number (1620612).

Almost surely, 2^16640724 is an apocalyptic number.

It is an amenable number.

16640724 is an abundant number, since it is smaller than the sum of its proper divisors (22253964).

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

16640724 is a wasteful number, since it uses less digits than its factorization.

16640724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375 (or 2373 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 16640724 is about 4079.3043524601. The cubic root of 16640724 is about 255.3038745715.

The spelling of 16640724 in words is "sixteen million, six hundred forty thousand, seven hundred twenty-four".