16546640 has 40 divisors (see below), whose sum is σ = 41970528. Its totient is φ = 6016640.

The previous prime is 16546639. The next prime is 16546643. The reversal of 16546640 is 4664561.

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

It is a junction number, because it is equal to n+sod(n) for n = 16546597 and 16546606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16546643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8522 + ... + 10281.

Almost surely, 2^16546640 is an apocalyptic number.

16546640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16546640 is an abundant number, since it is smaller than the sum of its proper divisors (25423888).

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

16546640 is a wasteful number, since it uses less digits than its factorization.

16546640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18827 (or 18821 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 16546640 is about 4067.7561382167. The cubic root of 16546640 is about 254.8218158001.

The spelling of 16546640 in words is "sixteen million, five hundred forty-six thousand, six hundred forty".