15609664 has 28 divisors (see below), whose sum is σ = 35401504. Its totient is φ = 6689664.

The previous prime is 15609661. The next prime is 15609667. The reversal of 15609664 is 46690651.

15609664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15609661) and next prime (15609667).

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×15609664² = 487323220385792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15609661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16974 + ... + 17869.

Almost surely, 2^15609664 is an apocalyptic number.

15609664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15609664 is an abundant number, since it is smaller than the sum of its proper divisors (19791840).

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

15609664 is an equidigital number, since it uses as much as digits as its factorization.

15609664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34862 (or 34852 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 15609664 is about 3950.9067313719. The cubic root of 15609664 is about 249.9181812257.

The spelling of 15609664 in words is "fifteen million, six hundred nine thousand, six hundred sixty-four".