83720280 has 64 divisors (see below), whose sum is σ = 287043840. Its totient is φ = 19135872.

The previous prime is 83720279. The next prime is 83720311. The reversal of 83720280 is 8202738.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48994 + ... + 50673.

It is an arithmetic number, because the mean of its divisors is an integer number (4485060).

Almost surely, 2^83720280 is an apocalyptic number.

It is an amenable number.

83720280 is an abundant number, since it is smaller than the sum of its proper divisors (203323560).

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

83720280 is a wasteful number, since it uses less digits than its factorization.

83720280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99688 (or 99684 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 83720280 is about 9149.8786877204. The cubic root of 83720280 is about 437.4652467632.

The spelling of 83720280 in words is "eighty-three million, seven hundred twenty thousand, two hundred eighty".