80861844 has 96 divisors (see below), whose sum is σ = 224874496. Its totient is φ = 22135680.

The previous prime is 80861839. The next prime is 80861849. The reversal of 80861844 is 44816808.

It is an interprime number because it is at equal distance from previous prime (80861839) and next prime (80861849).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220149 + ... + 220515.

Almost surely, 2^80861844 is an apocalyptic number.

80861844 is a gapful number since it is divisible by the number (84) 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 80861844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112437248).

80861844 is an abundant number, since it is smaller than the sum of its proper divisors (144012652).

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

80861844 is a wasteful number, since it uses less digits than its factorization.

80861844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 80861844 is about 8992.3213910536. The cubic root of 80861844 is about 432.4287367411.

The spelling of 80861844 in words is "eighty million, eight hundred sixty-one thousand, eight hundred forty-four".