81795975 has 12 divisors (see below), whose sum is σ = 135236136. Its totient is φ = 43624480.

The previous prime is 81795947. The next prime is 81795997. The reversal of 81795975 is 57959718.

It is not a de Polignac number, because 81795975 - 2⁶ = 81795911 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 545232 + ... + 545381.

It is an arithmetic number, because the mean of its divisors is an integer number (11269678).

Almost surely, 2^81795975 is an apocalyptic number.

81795975 is a deficient number, since it is larger than the sum of its proper divisors (53440161).

81795975 is a wasteful number, since it uses less digits than its factorization.

81795975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090626 (or 1090621 counting only the distinct ones).

The product of its digits is 793800, while the sum is 51.

The square root of 81795975 is about 9044.1127259671. The cubic root of 81795975 is about 434.0875311003.

The spelling of 81795975 in words is "eighty-one million, seven hundred ninety-five thousand, nine hundred seventy-five".