80981856 has 120 divisors (see below), whose sum is σ = 240886800. Its totient is φ = 26687232.

The previous prime is 80981839. The next prime is 80981869. The reversal of 80981856 is 65818908.

It is a super-3 number, since 3×80981856³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 406845 + ... + 407043.

It is an arithmetic number, because the mean of its divisors is an integer number (2007390).

Almost surely, 2^80981856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80981856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120443400).

80981856 is an abundant number, since it is smaller than the sum of its proper divisors (159904944).

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

80981856 is a wasteful number, since it uses less digits than its factorization.

80981856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 80981856 is about 8998.9919435457. The cubic root of 80981856 is about 432.6425622893.

Adding to 80981856 its sum of digits (45), we get a triangular number (80981901 = T₁₂₇₂₆).

The spelling of 80981856 in words is "eighty million, nine hundred eighty-one thousand, eight hundred fifty-six".