82890780 has 48 divisors (see below), whose sum is σ = 265251840. Its totient is φ = 18946368.

The previous prime is 82890763. The next prime is 82890823. The reversal of 82890780 is 8709828.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98260 + ... + 99099.

It is an arithmetic number, because the mean of its divisors is an integer number (5526080).

Almost surely, 2^82890780 is an apocalyptic number.

It is an amenable number.

82890780 is an abundant number, since it is smaller than the sum of its proper divisors (182361060).

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

82890780 is a wasteful number, since it uses less digits than its factorization.

82890780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197378 (or 197376 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 82890780 is about 9104.4373796517. The cubic root of 82890780 is about 436.0156476723.

The spelling of 82890780 in words is "eighty-two million, eight hundred ninety thousand, seven hundred eighty".