80881840 has 80 divisors (see below), whose sum is σ = 205174368. Its totient is φ = 29472768.

The previous prime is 80881789. The next prime is 80881849. The reversal of 80881840 is 4818808.

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

It is a self number, because there is not a number n which added to its sum of digits gives 80881840.

It is not an unprimeable number, because it can be changed into a prime (80881849) 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, 85852 + ... + 86788.

Almost surely, 2^80881840 is an apocalyptic number.

80881840 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 80881840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102587184).

80881840 is an abundant number, since it is smaller than the sum of its proper divisors (124292528).

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

80881840 is a wasteful number, since it uses less digits than its factorization.

With its successor (80881841) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1040).

80881840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 80881840 is about 8993.4331598117. The cubic root of 80881840 is about 432.4643783241.

The spelling of 80881840 in words is "eighty million, eight hundred eighty-one thousand, eight hundred forty".