81976075 has 24 divisors (see below), whose sum is σ = 104346000. Its totient is φ = 63864960.

The previous prime is 81976073. The next prime is 81976079. The reversal of 81976075 is 57067918.

It is not a de Polignac number, because 81976075 - 2¹ = 81976073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81976073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219589 + ... + 219961.

It is an arithmetic number, because the mean of its divisors is an integer number (4347750).

Almost surely, 2^81976075 is an apocalyptic number.

81976075 is a deficient number, since it is larger than the sum of its proper divisors (22369925).

81976075 is a wasteful number, since it uses less digits than its factorization.

81976075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 81976075 is about 9054.0640046335. The cubic root of 81976075 is about 434.4058917353.

The spelling of 81976075 in words is "eighty-one million, nine hundred seventy-six thousand, seventy-five".