16674640 has 20 divisors (see below), whose sum is σ = 38768724. Its totient is φ = 6669824.

The previous prime is 16674631. The next prime is 16674653. The reversal of 16674640 is 4647661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 14531344 = 1464^2 + 3812^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 16674596 and 16674605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104137 + ... + 104296.

Almost surely, 2^16674640 is an apocalyptic number.

16674640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16674640 is an abundant number, since it is smaller than the sum of its proper divisors (22094084).

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

16674640 is a wasteful number, since it uses less digits than its factorization.

16674640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208446 (or 208440 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 16674640 is about 4083.4593177844. The cubic root of 16674640 is about 255.4772045742.

The spelling of 16674640 in words is "sixteen million, six hundred seventy-four thousand, six hundred forty".