81501896 has 48 divisors (see below), whose sum is σ = 178677900. Its totient is φ = 34750464.

The previous prime is 81501881. The next prime is 81501913. The reversal of 81501896 is 69810518.

It can be written as a sum of positive squares in 2 ways, for example, as 59505796 + 21996100 = 7714^2 + 4690^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100340 + ... + 101148.

Almost surely, 2^81501896 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 81501896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89338950).

81501896 is an abundant number, since it is smaller than the sum of its proper divisors (97176004).

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

81501896 is a wasteful number, since it uses less digits than its factorization.

81501896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 81501896 is about 9027.8400517510. The cubic root of 81501896 is about 433.5666850989.

The spelling of 81501896 in words is "eighty-one million, five hundred one thousand, eight hundred ninety-six".