81370112 has 44 divisors (see below), whose sum is σ = 163841880. Its totient is φ = 40390656.

The previous prime is 81370097. The next prime is 81370123. The reversal of 81370112 is 21107318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234323 + ... + 234669.

Almost surely, 2^81370112 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 81370112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81920940).

81370112 is an abundant number, since it is smaller than the sum of its proper divisors (82471768).

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

81370112 is a wasteful number, since it uses less digits than its factorization.

81370112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 81370112 is about 9020.5383431367. The cubic root of 81370112 is about 433.3328746872.

The spelling of 81370112 in words is "eighty-one million, three hundred seventy thousand, one hundred twelve".