80639520 has 96 divisors (see below), whose sum is σ = 273575232. Its totient is φ = 19848192.

The previous prime is 80639509. The next prime is 80639527. The reversal of 80639520 is 2593608.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (80639527) 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, 222 + ... + 12701.

It is an arithmetic number, because the mean of its divisors is an integer number (2849742).

Almost surely, 2^80639520 is an apocalyptic number.

80639520 is a gapful number since it is divisible by the number (80) 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 80639520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136787616).

80639520 is an abundant number, since it is smaller than the sum of its proper divisors (192935712).

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

80639520 is a wasteful number, since it uses less digits than its factorization.

80639520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12954 (or 12946 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 80639520 is about 8979.9510020935. The cubic root of 80639520 is about 432.0320620922.

The spelling of 80639520 in words is "eighty million, six hundred thirty-nine thousand, five hundred twenty".