80665936 has 80 divisors (see below), whose sum is σ = 178738560. Its totient is φ = 34997760.

The previous prime is 80665931. The next prime is 80665939. The reversal of 80665936 is 63956608.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 80665892 and 80665901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80665931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259221 + ... + 259531.

It is an arithmetic number, because the mean of its divisors is an integer number (2234232).

Almost surely, 2^80665936 is an apocalyptic number.

80665936 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80665936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89369280).

80665936 is an abundant number, since it is smaller than the sum of its proper divisors (98072624).

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

80665936 is a wasteful number, since it uses less digits than its factorization.

80665936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 80665936 is about 8981.4217137378. The cubic root of 80665936 is about 432.0792321523.

The spelling of 80665936 in words is "eighty million, six hundred sixty-five thousand, nine hundred thirty-six".