81398808 has 48 divisors (see below), whose sum is σ = 227572800. Its totient is φ = 26256960.

The previous prime is 81398803. The next prime is 81398809. The reversal of 81398808 is 80889318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81398803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16003 + ... + 20466.

It is an arithmetic number, because the mean of its divisors is an integer number (4741100).

Almost surely, 2^81398808 is an apocalyptic number.

It is an amenable number.

81398808 is an abundant number, since it is smaller than the sum of its proper divisors (146173992).

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

81398808 is a wasteful number, since it uses less digits than its factorization.

81398808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36512 (or 36505 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 81398808 is about 9022.1287953564. The cubic root of 81398808 is about 433.3838084531.

The spelling of 81398808 in words is "eighty-one million, three hundred ninety-eight thousand, eight hundred eight".