15531696 has 80 divisors (see below), whose sum is σ = 45061600. Its totient is φ = 5121792.

The previous prime is 15531689. The next prime is 15531697. The reversal of 15531696 is 69613551.

15531696 is a `hidden beast` number, since 1 + 553 + 16 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15531696.

It is not an unprimeable number, because it can be changed into a prime (15531697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67710 + ... + 67938.

It is an arithmetic number, because the mean of its divisors is an integer number (563270).

Almost surely, 2^15531696 is an apocalyptic number.

15531696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15531696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22530800).

15531696 is an abundant number, since it is smaller than the sum of its proper divisors (29529904).

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

15531696 is a wasteful number, since it uses less digits than its factorization.

15531696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 391 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 15531696 is about 3941.0272772464. The cubic root of 15531696 is about 249.5013848596.

It can be divided in two parts, 1553 and 1696, that added together give a square (3249 = 57²).

The spelling of 15531696 in words is "fifteen million, five hundred thirty-one thousand, six hundred ninety-six".