81814104 has 128 divisors (see below), whose sum is σ = 242136000. Its totient is φ = 25546752.

The previous prime is 81814069. The next prime is 81814111. The reversal of 81814104 is 40141818.

It is a super-2 number, since 2×81814104² = 13387095226645632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231592 + ... + 231944.

Almost surely, 2^81814104 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 81814104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121068000).

81814104 is an abundant number, since it is smaller than the sum of its proper divisors (160321896).

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

81814104 is a wasteful number, since it uses less digits than its factorization.

81814104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 81814104 is about 9045.1149246430. The cubic root of 81814104 is about 434.1195986584.

It can be divided in two parts, 81814 and 104, that added together give a palindrome (81918).

The spelling of 81814104 in words is "eighty-one million, eight hundred fourteen thousand, one hundred four".