13664988 has 36 divisors (see below), whose sum is σ = 35479080. Its totient is φ = 4431456.

The previous prime is 13664969. The next prime is 13664999. The reversal of 13664988 is 88946631.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3798 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (985530).

Almost surely, 2^13664988 is an apocalyptic number.

13664988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13664988 is an abundant number, since it is smaller than the sum of its proper divisors (21814092).

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

13664988 is a wasteful number, since it uses less digits than its factorization.

13664988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306 (or 10301 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 13664988 is about 3696.6184547502. The cubic root of 13664988 is about 239.0762406814.

The spelling of 13664988 in words is "thirteen million, six hundred sixty-four thousand, nine hundred eighty-eight".