81082075 has 12 divisors (see below), whose sum is σ = 101221200. Its totient is φ = 64427360.

The previous prime is 81082073. The next prime is 81082087. The reversal of 81082075 is 57028018.

It is not a de Polignac number, because 81082075 - 2¹ = 81082073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81082073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7159 + ... + 14608.

It is an arithmetic number, because the mean of its divisors is an integer number (8435100).

Almost surely, 2^81082075 is an apocalyptic number.

81082075 is a deficient number, since it is larger than the sum of its proper divisors (20139125).

81082075 is a wasteful number, since it uses less digits than its factorization.

81082075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21926 (or 21921 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 81082075 is about 9004.5585677478. The cubic root of 81082075 is about 432.8209608142.

The spelling of 81082075 in words is "eighty-one million, eighty-two thousand, seventy-five".