13640704 has 88 divisors (see below), whose sum is σ = 34193088. Its totient is φ = 5283840.

The previous prime is 13640699. The next prime is 13640723. The reversal of 13640704 is 40704631.

It is a tau number, because it is divible by the number of its divisors (88).

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78762 + ... + 78934.

Almost surely, 2^13640704 is an apocalyptic number.

13640704 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13640704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17096544).

13640704 is an abundant number, since it is smaller than the sum of its proper divisors (20552384).

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

13640704 is a wasteful number, since it uses less digits than its factorization.

13640704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 13640704 is about 3693.3323706377. The cubic root of 13640704 is about 238.9345362043.

The spelling of 13640704 in words is "thirteen million, six hundred forty thousand, seven hundred four".