81370704 has 40 divisors (see below), whose sum is σ = 222575040. Its totient is φ = 25527808.

The previous prime is 81370699. The next prime is 81370717. The reversal of 81370704 is 40707318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49044 + ... + 50675.

It is an arithmetic number, because the mean of its divisors is an integer number (5564376).

Almost surely, 2^81370704 is an apocalyptic number.

It is an amenable number.

81370704 is an abundant number, since it is smaller than the sum of its proper divisors (141204336).

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

81370704 is a wasteful number, since it uses less digits than its factorization.

81370704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99747 (or 99741 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 81370704 is about 9020.5711570831. The cubic root of 81370704 is about 433.3339255745. Note that the first 3 decimals are identical.

It can be divided in two parts, 813 and 70704, that added together give a palindrome (71517).

The spelling of 81370704 in words is "eighty-one million, three hundred seventy thousand, seven hundred four".