83431890 has 32 divisors (see below), whose sum is σ = 222485760. Its totient is φ = 22248432.

The previous prime is 83431889. The next prime is 83431891. The reversal of 83431890 is 9813438.

It is an interprime number because it is at equal distance from previous prime (83431889) and next prime (83431891).

It is not an unprimeable number, because it can be changed into a prime (83431891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154234 + ... + 154773.

It is an arithmetic number, because the mean of its divisors is an integer number (6952680).

Almost surely, 2^83431890 is an apocalyptic number.

83431890 is an abundant number, since it is smaller than the sum of its proper divisors (139053870).

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

83431890 is a wasteful number, since it uses less digits than its factorization.

83431890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309023 (or 309017 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 83431890 is about 9134.1058675713. The cubic root of 83431890 is about 436.9623588864.

The spelling of 83431890 in words is "eighty-three million, four hundred thirty-one thousand, eight hundred ninety".