82081790 has 32 divisors (see below), whose sum is σ = 171002880. Its totient is φ = 27784224.

The previous prime is 82081781. The next prime is 82081793. The reversal of 82081790 is 9718028.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 82081790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82081793) 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, 1892 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (5343840).

Almost surely, 2^82081790 is an apocalyptic number.

82081790 is an abundant number, since it is smaller than the sum of its proper divisors (88921090).

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

82081790 is a wasteful number, since it uses less digits than its factorization.

82081790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14936.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 82081790 is about 9059.9001098246. The cubic root of 82081790 is about 434.5925457575.

The spelling of 82081790 in words is "eighty-two million, eighty-one thousand, seven hundred ninety".