81538696 has 16 divisors (see below), whose sum is σ = 152983440. Its totient is φ = 40743120.

The previous prime is 81538693. The next prime is 81538739. The reversal of 81538696 is 69683518.

It is not an unprimeable number, because it can be changed into a prime (81538693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18235 + ... + 22261.

It is an arithmetic number, because the mean of its divisors is an integer number (9561465).

Almost surely, 2^81538696 is an apocalyptic number.

It is an amenable number.

81538696 is a deficient number, since it is larger than the sum of its proper divisors (71444744).

81538696 is a wasteful number, since it uses less digits than its factorization.

81538696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564 (or 6560 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 81538696 is about 9029.8779615231. The cubic root of 81538696 is about 433.6319304245.

The spelling of 81538696 in words is "eighty-one million, five hundred thirty-eight thousand, six hundred ninety-six".