83281820 has 24 divisors (see below), whose sum is σ = 179620224. Its totient is φ = 32412096.

The previous prime is 83281819. The next prime is 83281853. The reversal of 83281820 is 2818238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55532 + ... + 57011.

It is an arithmetic number, because the mean of its divisors is an integer number (7484176).

Almost surely, 2^83281820 is an apocalyptic number.

It is an amenable number.

83281820 is an abundant number, since it is smaller than the sum of its proper divisors (96338404).

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

83281820 is a wasteful number, since it uses less digits than its factorization.

83281820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112589 (or 112587 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 83281820 is about 9125.8873541152. The cubic root of 83281820 is about 436.7002117332.

The spelling of 83281820 in words is "eighty-three million, two hundred eighty-one thousand, eight hundred twenty".