80381840 has 80 divisors (see below), whose sum is σ = 233020800. Its totient is φ = 25052160.

The previous prime is 80381839. The next prime is 80381879. The reversal of 80381840 is 4818308.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×80381840² = 12922480403571200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80381797 and 80381806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365 + ... + 12684.

It is an arithmetic number, because the mean of its divisors is an integer number (2912760).

Almost surely, 2^80381840 is an apocalyptic number.

80381840 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 80381840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116510400).

80381840 is an abundant number, since it is smaller than the sum of its proper divisors (152638960).

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

80381840 is a wasteful number, since it uses less digits than its factorization.

80381840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080 (or 13074 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 80381840 is about 8965.5920049933. The cubic root of 80381840 is about 431.5713913118.

The spelling of 80381840 in words is "eighty million, three hundred eighty-one thousand, eight hundred forty".