82720897 has 4 divisors (see below), whose sum is σ = 94538176. Its totient is φ = 70903620.

The previous prime is 82720879. The next prime is 82720901. The reversal of 82720897 is 79802728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82720897 - 2²³ = 74332289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82720817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5908629 + ... + 5908642.

It is an arithmetic number, because the mean of its divisors is an integer number (23634544).

Almost surely, 2^82720897 is an apocalyptic number.

It is an amenable number.

82720897 is a deficient number, since it is larger than the sum of its proper divisors (11817279).

82720897 is a wasteful number, since it uses less digits than its factorization.

82720897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11817278.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 82720897 is about 9095.1029131066. The cubic root of 82720897 is about 435.7175754912.

The spelling of 82720897 in words is "eighty-two million, seven hundred twenty thousand, eight hundred ninety-seven".