82290820 has 48 divisors (see below), whose sum is σ = 178738560. Its totient is φ = 31804416.

The previous prime is 82290797. The next prime is 82290827. The reversal of 82290820 is 2809228.

It is not an unprimeable number, because it can be changed into a prime (82290827) 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, 88116 + ... + 89044.

It is an arithmetic number, because the mean of its divisors is an integer number (3723720).

Almost surely, 2^82290820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82290820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89369280).

82290820 is an abundant number, since it is smaller than the sum of its proper divisors (96447740).

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

82290820 is a wasteful number, since it uses less digits than its factorization.

82290820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 82290820 is about 9071.4287739033. The cubic root of 82290820 is about 434.9611450740.

The spelling of 82290820 in words is "eighty-two million, two hundred ninety thousand, eight hundred twenty".