82381820 has 12 divisors (see below), whose sum is σ = 173001864. Its totient is φ = 32952720.

The previous prime is 82381811. The next prime is 82381861. The reversal of 82381820 is 2818328.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2059526 + ... + 2059565.

It is an arithmetic number, because the mean of its divisors is an integer number (14416822).

Almost surely, 2^82381820 is an apocalyptic number.

It is an amenable number.

82381820 is an abundant number, since it is smaller than the sum of its proper divisors (90620044).

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

82381820 is a wasteful number, since it uses less digits than its factorization.

82381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119100 (or 4119098 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 82381820 is about 9076.4431359426. The cubic root of 82381820 is about 435.1214176414.

The spelling of 82381820 in words is "eighty-two million, three hundred eighty-one thousand, eight hundred twenty".