81307883 has 8 divisors (see below), whose sum is σ = 84770928. Its totient is φ = 77916384.

The previous prime is 81307873. The next prime is 81307927. The reversal of 81307883 is 38870318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81307883 - 2¹⁰ = 81306859 is a prime.

It is a super-2 number, since 2×81307883² = 13221943675883378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81307873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15560 + ... + 20117.

It is an arithmetic number, because the mean of its divisors is an integer number (10596366).

Almost surely, 2^81307883 is an apocalyptic number.

81307883 is a deficient number, since it is larger than the sum of its proper divisors (3463045).

81307883 is a wasteful number, since it uses less digits than its factorization.

81307883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35773.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81307883 is about 9017.0883881661. The cubic root of 81307883 is about 433.2223806008. Note that the first 3 decimals are identical.

The spelling of 81307883 in words is "eighty-one million, three hundred seven thousand, eight hundred eighty-three".