15709968 has 30 divisors (see below), whose sum is σ = 43966494. Its totient is φ = 5236608.

The previous prime is 15709961. The next prime is 15709997. The reversal of 15709968 is 86990751.

It can be written as a sum of positive squares in only one way, i.e., 13046544 + 2663424 = 3612^2 + 1632^2 .

It is a super-2 number, since 2×15709968² = 493606189122048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15709961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54405 + ... + 54692.

Almost surely, 2^15709968 is an apocalyptic number.

15709968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

15709968 is an abundant number, since it is smaller than the sum of its proper divisors (28256526).

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

15709968 is a wasteful number, since it uses less digits than its factorization.

15709968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109111 (or 109102 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 15709968 is about 3963.5801997689. The cubic root of 15709968 is about 250.4523437137.

The spelling of 15709968 in words is "fifteen million, seven hundred nine thousand, nine hundred sixty-eight".