81835164 has 48 divisors (see below), whose sum is σ = 219018240. Its totient is φ = 26397360.

The previous prime is 81835153. The next prime is 81835181. The reversal of 81835164 is 46153818.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8874 + ... + 15569.

It is an arithmetic number, because the mean of its divisors is an integer number (4562880).

Almost surely, 2^81835164 is an apocalyptic number.

It is an amenable number.

81835164 is an abundant number, since it is smaller than the sum of its proper divisors (137183076).

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

81835164 is a wasteful number, since it uses less digits than its factorization.

81835164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24487 (or 24479 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81835164 is about 9046.2790140477. The cubic root of 81835164 is about 434.1568447808.

The spelling of 81835164 in words is "eighty-one million, eight hundred thirty-five thousand, one hundred sixty-four".