16664840 has 16 divisors (see below), whose sum is σ = 37495980. Its totient is φ = 6665920.

The previous prime is 16664833. The next prime is 16664861. The reversal of 16664840 is 4846661.

It can be written as a sum of positive squares in 2 ways, for example, as 16662724 + 2116 = 4082^2 + 46^2 .

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 16664840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208271 + ... + 208350.

Almost surely, 2^16664840 is an apocalyptic number.

16664840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16664840 is an abundant number, since it is smaller than the sum of its proper divisors (20831140).

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

16664840 is a wasteful number, since it uses less digits than its factorization.

16664840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416632 (or 416628 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 16664840 is about 4082.2591784452. The cubic root of 16664840 is about 255.4271451776.

The spelling of 16664840 in words is "sixteen million, six hundred sixty-four thousand, eight hundred forty".