81477708 has 48 divisors (see below), whose sum is σ = 205400160. Its totient is φ = 24989184.

The previous prime is 81477691. The next prime is 81477713. The reversal of 81477708 is 80777418.

81477708 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

81477708 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 81477708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63166 + ... + 64442.

It is an arithmetic number, because the mean of its divisors is an integer number (4279170).

Almost surely, 2^81477708 is an apocalyptic number.

It is an amenable number.

81477708 is an abundant number, since it is smaller than the sum of its proper divisors (123922452).

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

81477708 is a wasteful number, since it uses less digits than its factorization.

81477708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706 (or 1704 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 81477708 is about 9026.5003185066. The cubic root of 81477708 is about 433.5237897836.

The spelling of 81477708 in words is "eighty-one million, four hundred seventy-seven thousand, seven hundred eight".