81396675 has 18 divisors (see below), whose sum is σ = 145790892. Its totient is φ = 43411440.

The previous prime is 81396671. The next prime is 81396691. The reversal of 81396675 is 57669318.

It is a happy number.

It is not a de Polignac number, because 81396675 - 2² = 81396671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81396675.

It is not an unprimeable number, because it can be changed into a prime (81396671) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 180657 + ... + 181106.

It is an arithmetic number, because the mean of its divisors is an integer number (8099494).

Almost surely, 2^81396675 is an apocalyptic number.

81396675 is a deficient number, since it is larger than the sum of its proper divisors (64394217).

81396675 is a wasteful number, since it uses less digits than its factorization.

81396675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361779 (or 361771 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 81396675 is about 9022.0105852299. The cubic root of 81396675 is about 433.3800229114.

The spelling of 81396675 in words is "eighty-one million, three hundred ninety-six thousand, six hundred seventy-five".