15681996 has 54 divisors (see below), whose sum is σ = 43462692. Its totient is φ = 4728240.

The previous prime is 15681989. The next prime is 15681997. The reversal of 15681996 is 69918651.

It is not an unprimeable number, because it can be changed into a prime (15681997) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 78705 + ... + 78903.

Almost surely, 2^15681996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15681996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21731346).

15681996 is an abundant number, since it is smaller than the sum of its proper divisors (27780696).

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

15681996 is a wasteful number, since it uses less digits than its factorization.

15681996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 215 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 15681996 is about 3960.0499996843. The cubic root of 15681996 is about 250.3036098018.

The spelling of 15681996 in words is "fifteen million, six hundred eighty-one thousand, nine hundred ninety-six".