16555640 has 32 divisors (see below), whose sum is σ = 37510560. Its totient is φ = 6576000.

The previous prime is 16555639. The next prime is 16555657. The reversal of 16555640 is 4655561.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16555597 and 16555606.

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, 4670 + ... + 7410.

It is an arithmetic number, because the mean of its divisors is an integer number (1172205).

Almost surely, 2^16555640 is an apocalyptic number.

16555640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16555640 is an abundant number, since it is smaller than the sum of its proper divisors (20954920).

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

16555640 is a wasteful number, since it uses less digits than its factorization.

16555640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903 (or 2899 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 16555640 is about 4068.8622488357. The cubic root of 16555640 is about 254.8680080716.

The spelling of 16555640 in words is "sixteen million, five hundred fifty-five thousand, six hundred forty".