82785791 has 16 divisors (see below), whose sum is σ = 92448000. Its totient is φ = 73497600.

The previous prime is 82785757. The next prime is 82785797. The reversal of 82785791 is 19758728.

It is not a de Polignac number, because 82785791 - 2⁶ = 82785727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82785797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128831 + ... + 129471.

It is an arithmetic number, because the mean of its divisors is an integer number (5778000).

Almost surely, 2^82785791 is an apocalyptic number.

82785791 is a deficient number, since it is larger than the sum of its proper divisors (9662209).

82785791 is a wasteful number, since it uses less digits than its factorization.

82785791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its digits is 282240, while the sum is 47.

The square root of 82785791 is about 9098.6697379342. The cubic root of 82785791 is about 435.8314849007.

The spelling of 82785791 in words is "eighty-two million, seven hundred eighty-five thousand, seven hundred ninety-one".