81307376 has 30 divisors (see below), whose sum is σ = 159409440. Its totient is φ = 40174944.

The previous prime is 81307337. The next prime is 81307399. The reversal of 81307376 is 67370318.

It is a super-2 number, since 2×81307376² = 13221778784010752, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 169505 + ... + 169983.

It is an arithmetic number, because the mean of its divisors is an integer number (5313648).

Almost surely, 2^81307376 is an apocalyptic number.

It is an amenable number.

81307376 is a deficient number, since it is larger than the sum of its proper divisors (78102064).

81307376 is a wasteful number, since it uses less digits than its factorization.

81307376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 81307376 is about 9017.0602748346. The cubic root of 81307376 is about 433.2214801379.

The spelling of 81307376 in words is "eighty-one million, three hundred seven thousand, three hundred seventy-six".