81700965 has 24 divisors (see below), whose sum is σ = 146185728. Its totient is φ = 42167520.

The previous prime is 81700937. The next prime is 81701029. The reversal of 81700965 is 56900718.

It is not a de Polignac number, because 81700965 - 2⁸ = 81700709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27889 + ... + 30678.

It is an arithmetic number, because the mean of its divisors is an integer number (6091072).

Almost surely, 2^81700965 is an apocalyptic number.

It is an amenable number.

81700965 is a deficient number, since it is larger than the sum of its proper divisors (64484763).

81700965 is a wasteful number, since it uses less digits than its factorization.

81700965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58609 (or 58606 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 81700965 is about 9038.8586115726. The cubic root of 81700965 is about 433.9193947298.

The spelling of 81700965 in words is "eighty-one million, seven hundred thousand, nine hundred sixty-five".