83820990 has 32 divisors (see below), whose sum is σ = 219459456. Its totient is φ = 20320160.

The previous prime is 83820977. The next prime is 83821013. The reversal of 83820990 is 9902838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126672 + ... + 127331.

It is an arithmetic number, because the mean of its divisors is an integer number (6858108).

Almost surely, 2^83820990 is an apocalyptic number.

83820990 is an abundant number, since it is smaller than the sum of its proper divisors (135638466).

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

83820990 is a wasteful number, since it uses less digits than its factorization.

83820990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254024.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 83820990 is about 9155.3803853253. The cubic root of 83820990 is about 437.6405904627.

The spelling of 83820990 in words is "eighty-three million, eight hundred twenty thousand, nine hundred ninety".