81788708 has 12 divisors (see below), whose sum is σ = 143688972. Its totient is φ = 40734720.

The previous prime is 81788701. The next prime is 81788741. The reversal of 81788708 is 80788718.

It can be written as a sum of positive squares in 2 ways, for example, as 51955264 + 29833444 = 7208^2 + 5462^2 .

It is not an unprimeable number, because it can be changed into a prime (81788701) 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, 38753 + ... + 40808.

It is an arithmetic number, because the mean of its divisors is an integer number (11974081).

Almost surely, 2^81788708 is an apocalyptic number.

It is an amenable number.

81788708 is a deficient number, since it is larger than the sum of its proper divisors (61900264).

81788708 is a wasteful number, since it uses less digits than its factorization.

81788708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79822 (or 79820 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 47.

The square root of 81788708 is about 9043.7109639793. The cubic root of 81788708 is about 434.0746755064.

The spelling of 81788708 in words is "eighty-one million, seven hundred eighty-eight thousand, seven hundred eight".