82591278 has 64 divisors (see below), whose sum is σ = 209889792. Its totient is φ = 21041280.

The previous prime is 82591273. The next prime is 82591279. The reversal of 82591278 is 87219528.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82591273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22800 + ... + 26172.

It is an arithmetic number, because the mean of its divisors is an integer number (3279528).

Almost surely, 2^82591278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82591278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104944896).

82591278 is an abundant number, since it is smaller than the sum of its proper divisors (127298514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82591278 is a wasteful number, since it uses less digits than its factorization.

82591278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449.

The product of its digits is 80640, while the sum is 42.

The square root of 82591278 is about 9087.9743617596. The cubic root of 82591278 is about 435.4898748614.

The spelling of 82591278 in words is "eighty-two million, five hundred ninety-one thousand, two hundred seventy-eight".