81870696 has 64 divisors (see below), whose sum is σ = 239400000. Its totient is φ = 25852608.

The previous prime is 81870643. The next prime is 81870697. The reversal of 81870696 is 69607818.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81870697) 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, 5871 + ... + 14078.

It is an arithmetic number, because the mean of its divisors is an integer number (3740625).

Almost surely, 2^81870696 is an apocalyptic number.

It is an amenable number.

81870696 is an abundant number, since it is smaller than the sum of its proper divisors (157529304).

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

81870696 is a wasteful number, since it uses less digits than its factorization.

81870696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19983 (or 19973 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 81870696 is about 9048.2427023152. The cubic root of 81870696 is about 434.2196711915.

The spelling of 81870696 in words is "eighty-one million, eight hundred seventy thousand, six hundred ninety-six".