15680965 has 8 divisors (see below), whose sum is σ = 19126008. Its totient is φ = 12338880.

The previous prime is 15680927. The next prime is 15680993. The reversal of 15680965 is 56908651.

It can be written as a sum of positive squares in 4 ways, for example, as 54756 + 15626209 = 234^2 + 3953^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15680965 - 2⁷ = 15680837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25402 + ... + 26011.

It is an arithmetic number, because the mean of its divisors is an integer number (2390751).

Almost surely, 2^15680965 is an apocalyptic number.

It is an amenable number.

15680965 is a deficient number, since it is larger than the sum of its proper divisors (3445043).

15680965 is an equidigital number, since it uses as much as digits as its factorization.

15680965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51479.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 15680965 is about 3959.9198224207. The cubic root of 15680965 is about 250.2981243462.

The spelling of 15680965 in words is "fifteen million, six hundred eighty thousand, nine hundred sixty-five".