15991648 has 12 divisors (see below), whose sum is σ = 31483620. Its totient is φ = 7995808.

The previous prime is 15991639. The next prime is 15991649. The reversal of 15991648 is 84619951.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15991649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249838 + ... + 249901.

It is an arithmetic number, because the mean of its divisors is an integer number (2623635).

Almost surely, 2^15991648 is an apocalyptic number.

It is an amenable number.

15991648 is a deficient number, since it is larger than the sum of its proper divisors (15491972).

15991648 is an equidigital number, since it uses as much as digits as its factorization.

15991648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499749 (or 499741 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 15991648 is about 3998.9558637224. The cubic root of 15991648 is about 251.9403570952.

The spelling of 15991648 in words is "fifteen million, nine hundred ninety-one thousand, six hundred forty-eight".