83891890 has 16 divisors (see below), whose sum is σ = 155877120. Its totient is φ = 32474160.

The previous prime is 83891887. The next prime is 83891893. The reversal of 83891890 is 9819838.

It is an interprime number because it is at equal distance from previous prime (83891887) and next prime (83891893).

It is a self number, because there is not a number n which added to its sum of digits gives 83891890.

It is not an unprimeable number, because it can be changed into a prime (83891893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135000 + ... + 135619.

It is an arithmetic number, because the mean of its divisors is an integer number (9742320).

Almost surely, 2^83891890 is an apocalyptic number.

83891890 is a deficient number, since it is larger than the sum of its proper divisors (71985230).

83891890 is a wasteful number, since it uses less digits than its factorization.

83891890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270657.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 83891890 is about 9159.2516069819. The cubic root of 83891890 is about 437.7639484801.

The spelling of 83891890 in words is "eighty-three million, eight hundred ninety-one thousand, eight hundred ninety".