83856990 has 64 divisors (see below), whose sum is σ = 231289344. Its totient is φ = 19060608.

The previous prime is 83856979. The next prime is 83857003. The reversal of 83856990 is 9965838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40357 + ... + 42383.

It is an arithmetic number, because the mean of its divisors is an integer number (3613896).

Almost surely, 2^83856990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83856990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115644672).

83856990 is an abundant number, since it is smaller than the sum of its proper divisors (147432354).

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

83856990 is a wasteful number, since it uses less digits than its factorization.

83856990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 83856990 is about 9157.3462313052. The cubic root of 83856990 is about 437.7032350989.

The spelling of 83856990 in words is "eighty-three million, eight hundred fifty-six thousand, nine hundred ninety".