82664591 has 8 divisors (see below), whose sum is σ = 87880464. Its totient is φ = 77488000.

The previous prime is 82664581. The next prime is 82664627. The reversal of 82664591 is 19546628.

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 82664591 - 2¹⁸ = 82402447 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 (82664501) 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, 5420 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (10985058).

Almost surely, 2^82664591 is an apocalyptic number.

82664591 is a deficient number, since it is larger than the sum of its proper divisors (5215873).

82664591 is a wasteful number, since it uses less digits than its factorization.

82664591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19641.

The product of its digits is 103680, while the sum is 41.

The square root of 82664591 is about 9092.0069841592. The cubic root of 82664591 is about 435.6186924470.

The spelling of 82664591 in words is "eighty-two million, six hundred sixty-four thousand, five hundred ninety-one".