16549640 has 32 divisors (see below), whose sum is σ = 38033280. Its totient is φ = 6478272.

The previous prime is 16549597. The next prime is 16549661. The reversal of 16549640 is 4694561.

It is a self number, because there is not a number n which added to its sum of digits gives 16549640.

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, 2522 + ... + 6281.

It is an arithmetic number, because the mean of its divisors is an integer number (1188540).

Almost surely, 2^16549640 is an apocalyptic number.

16549640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16549640 is an abundant number, since it is smaller than the sum of its proper divisors (21483640).

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

16549640 is a wasteful number, since it uses less digits than its factorization.

16549640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8861 (or 8857 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16549640 is about 4068.1248751728. The cubic root of 16549640 is about 254.8372150846.

The spelling of 16549640 in words is "sixteen million, five hundred forty-nine thousand, six hundred forty".