83661920 has 24 divisors (see below), whose sum is σ = 197651664. Its totient is φ = 33464704.

The previous prime is 83661917. The next prime is 83661943. The reversal of 83661920 is 2916638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261284 + ... + 261603.

It is an arithmetic number, because the mean of its divisors is an integer number (8235486).

Almost surely, 2^83661920 is an apocalyptic number.

83661920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83661920 is an abundant number, since it is smaller than the sum of its proper divisors (113989744).

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

83661920 is a wasteful number, since it uses less digits than its factorization.

83661920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522902 (or 522894 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 83661920 is about 9146.6890184372. The cubic root of 83661920 is about 437.3635732444.

The spelling of 83661920 in words is "eighty-three million, six hundred sixty-one thousand, nine hundred twenty".