81376504 has 32 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 36884320.

The previous prime is 81376483. The next prime is 81376541. The reversal of 81376504 is 40567318.

It is a self number, because there is not a number n which added to its sum of digits gives 81376504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35769 + ... + 37975.

It is an arithmetic number, because the mean of its divisors is an integer number (5216400).

Almost surely, 2^81376504 is an apocalyptic number.

It is an amenable number.

81376504 is an abundant number, since it is smaller than the sum of its proper divisors (85548296).

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

81376504 is a wasteful number, since it uses less digits than its factorization.

81376504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643 (or 2639 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 81376504 is about 9020.8926387581. The cubic root of 81376504 is about 433.3442211597.

It can be divided in two parts, 8137 and 6504, that added together give a palindrome (14641).

The spelling of 81376504 in words is "eighty-one million, three hundred seventy-six thousand, five hundred four".