80531840 has 64 divisors (see below), whose sum is σ = 199206000. Its totient is φ = 31094784.

The previous prime is 80531813. The next prime is 80531881. The reversal of 80531840 is 4813508.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 16391 + ... + 20729.

Almost surely, 2^80531840 is an apocalyptic number.

80531840 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 80531840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99603000).

80531840 is an abundant number, since it is smaller than the sum of its proper divisors (118674160).

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

80531840 is a wasteful number, since it uses less digits than its factorization.

80531840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387 (or 4375 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 80531840 is about 8973.9534208731. The cubic root of 80531840 is about 431.8396753039.

The spelling of 80531840 in words is "eighty million, five hundred thirty-one thousand, eight hundred forty".