82529721 has 24 divisors (see below), whose sum is σ = 123381440. Its totient is φ = 53117856.

The previous prime is 82529717. The next prime is 82529723. The reversal of 82529721 is 12792528.

It is not a de Polignac number, because 82529721 - 2² = 82529717 is a prime.

It is a super-2 number, since 2×82529721² = 13622309696675682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82529723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45396 + ... + 47178.

Almost surely, 2^82529721 is an apocalyptic number.

It is an amenable number.

82529721 is a deficient number, since it is larger than the sum of its proper divisors (40851719).

82529721 is a wasteful number, since it uses less digits than its factorization.

82529721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965 (or 1962 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 82529721 is about 9084.5870021702. The cubic root of 82529721 is about 435.3816547455.

The spelling of 82529721 in words is "eighty-two million, five hundred twenty-nine thousand, seven hundred twenty-one".