16640672 has 12 divisors (see below), whose sum is σ = 32761386. Its totient is φ = 8320320.

The previous prime is 16640651. The next prime is 16640681. The reversal of 16640672 is 27604661.

It can be written as a sum of positive squares in only one way, i.e., 16613776 + 26896 = 4076^2 + 164^2 .

It is a super-3 number, since 3×16640672³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 520021 = 16640672 / (1 + 6 + 6 + 4 + 0 + 6 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259979 + ... + 260042.

Almost surely, 2^16640672 is an apocalyptic number.

It is an amenable number.

16640672 is a deficient number, since it is larger than the sum of its proper divisors (16120714).

16640672 is an equidigital number, since it uses as much as digits as its factorization.

16640672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520031 (or 520023 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 16640672 is about 4079.2979788194. The cubic root of 16640672 is about 255.3036086412.

The spelling of 16640672 in words is "sixteen million, six hundred forty thousand, six hundred seventy-two".