82520391 has 8 divisors (see below), whose sum is σ = 112368384. Its totient is φ = 53843000.

The previous prime is 82520381. The next prime is 82520393. The reversal of 82520391 is 19302528.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82520391 - 2⁵ = 82520359 is a prime.

It is a super-2 number, since 2×82520391² = 13619229861585762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82520393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292485 + ... + 292766.

It is an arithmetic number, because the mean of its divisors is an integer number (14046048).

Almost surely, 2^82520391 is an apocalyptic number.

82520391 is a deficient number, since it is larger than the sum of its proper divisors (29847993).

82520391 is a wasteful number, since it uses less digits than its factorization.

82520391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585301.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 82520391 is about 9084.0734805483. The cubic root of 82520391 is about 435.3652474687.

The spelling of 82520391 in words is "eighty-two million, five hundred twenty thousand, three hundred ninety-one".