16904640 has 56 divisors (see below), whose sum is σ = 53675280. Its totient is φ = 4507648.

The previous prime is 16904611. The next prime is 16904663. The reversal of 16904640 is 4640961.

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

It is a junction number, because it is equal to n+sod(n) for n = 16904598 and 16904607.

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, 7845 + ... + 9764.

Almost surely, 2^16904640 is an apocalyptic number.

16904640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16904640 is an abundant number, since it is smaller than the sum of its proper divisors (36770640).

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

16904640 is a wasteful number, since it uses less digits than its factorization.

16904640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17629 (or 17619 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 16904640 is about 4111.5252644244. The cubic root of 16904640 is about 256.6464780508.

The spelling of 16904640 in words is "sixteen million, nine hundred four thousand, six hundred forty".