16490640 has 40 divisors (see below), whose sum is σ = 51121728. Its totient is φ = 4397440.

The previous prime is 16490633. The next prime is 16490653. The reversal of 16490640 is 4609461.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 16490598 and 16490607.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 34116 + ... + 34595.

Almost surely, 2^16490640 is an apocalyptic number.

16490640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16490640 is an abundant number, since it is smaller than the sum of its proper divisors (34631088).

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

16490640 is a wasteful number, since it uses less digits than its factorization.

16490640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68727 (or 68721 counting only the distinct ones).

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

The square root of 16490640 is about 4060.8669025222. The cubic root of 16490640 is about 254.5340202037.

The spelling of 16490640 in words is "sixteen million, four hundred ninety thousand, six hundred forty".