15961668 has 24 divisors (see below), whose sum is σ = 37363872. Its totient is φ = 5303424.

The previous prime is 15961651. The next prime is 15961697. The reversal of 15961668 is 86616951.

It is a happy number.

15961668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 2071 + ... + 6017.

It is an arithmetic number, because the mean of its divisors is an integer number (1556828).

Almost surely, 2^15961668 is an apocalyptic number.

It is an amenable number.

15961668 is an abundant number, since it is smaller than the sum of its proper divisors (21402204).

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

15961668 is a wasteful number, since it uses less digits than its factorization.

15961668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291 (or 4289 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 15961668 is about 3995.2056267481. The cubic root of 15961668 is about 251.7828186752.

The spelling of 15961668 in words is "fifteen million, nine hundred sixty-one thousand, six hundred sixty-eight".