81695364 has 24 divisors (see below), whose sum is σ = 200655840. Its totient is φ = 25798464.

The previous prime is 81695347. The next prime is 81695423. The reversal of 81695364 is 46359618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178929 + ... + 179384.

It is an arithmetic number, because the mean of its divisors is an integer number (8360660).

Almost surely, 2^81695364 is an apocalyptic number.

It is an amenable number.

81695364 is an abundant number, since it is smaller than the sum of its proper divisors (118960476).

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

81695364 is a wasteful number, since it uses less digits than its factorization.

81695364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358339 (or 358337 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 81695364 is about 9038.5487773204. The cubic root of 81695364 is about 433.9094787389.

The spelling of 81695364 in words is "eighty-one million, six hundred ninety-five thousand, three hundred sixty-four".