81859104 has 36 divisors (see below), whose sum is σ = 232787646. Its totient is φ = 27286272.

The previous prime is 81859091. The next prime is 81859111. The reversal of 81859104 is 40195818.

It can be written as a sum of positive squares in only one way, i.e., 42771600 + 39087504 = 6540^2 + 6252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141829 + ... + 142404.

Almost surely, 2^81859104 is an apocalyptic number.

It is an amenable number.

81859104 is an abundant number, since it is smaller than the sum of its proper divisors (150928542).

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

81859104 is a wasteful number, since it uses less digits than its factorization.

81859104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284249 (or 284238 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 81859104 is about 9047.6021132674. The cubic root of 81859104 is about 434.1991766301.

The spelling of 81859104 in words is "eighty-one million, eight hundred fifty-nine thousand, one hundred four".