82521769 has 16 divisors (see below), whose sum is σ = 98887680. Its totient is φ = 67977360.

The previous prime is 82521763. The next prime is 82521797. The reversal of 82521769 is 96712528.

It is a de Polignac number, because none of the positive numbers 2^k-82521769 is a prime.

It is a super-2 number, since 2×82521769² = 13619684717778722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82521763) 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, 3777 + ... + 13390.

It is an arithmetic number, because the mean of its divisors is an integer number (6180480).

Almost surely, 2^82521769 is an apocalyptic number.

It is an amenable number.

82521769 is a deficient number, since it is larger than the sum of its proper divisors (16365911).

82521769 is a wasteful number, since it uses less digits than its factorization.

82521769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17220.

The product of its digits is 60480, while the sum is 40.

The square root of 82521769 is about 9084.1493272623. The cubic root of 82521769 is about 435.3676708293.

The spelling of 82521769 in words is "eighty-two million, five hundred twenty-one thousand, seven hundred sixty-nine".