16564540 has 24 divisors (see below), whose sum is σ = 35908992. Its totient is φ = 6411840.

The previous prime is 16564517. The next prime is 16564547. The reversal of 16564540 is 4546561.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12739 + ... + 13978.

It is an arithmetic number, because the mean of its divisors is an integer number (1496208).

Almost surely, 2^16564540 is an apocalyptic number.

16564540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16564540 is an abundant number, since it is smaller than the sum of its proper divisors (19344452).

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

16564540 is a wasteful number, since it uses less digits than its factorization.

16564540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26757 (or 26755 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 16564540 is about 4069.9557737155. The cubic root of 16564540 is about 254.9136706358.

The spelling of 16564540 in words is "sixteen million, five hundred sixty-four thousand, five hundred forty".