83931280 has 20 divisors (see below), whose sum is σ = 195140412. Its totient is φ = 33572480.

The previous prime is 83931271. The next prime is 83931293. The reversal of 83931280 is 8213938.

It can be written as a sum of positive squares in 2 ways, for example, as 41525136 + 42406144 = 6444^2 + 6512^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524491 + ... + 524650.

Almost surely, 2^83931280 is an apocalyptic number.

83931280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83931280 is an abundant number, since it is smaller than the sum of its proper divisors (111209132).

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

83931280 is a wasteful number, since it uses less digits than its factorization.

83931280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049154 (or 1049148 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 83931280 is about 9161.4016394873. The cubic root of 83931280 is about 437.8324526142.

The spelling of 83931280 in words is "eighty-three million, nine hundred thirty-one thousand, two hundred eighty".