81288858 has 32 divisors (see below), whose sum is σ = 188355456. Its totient is φ = 22906368.

The previous prime is 81288853. The next prime is 81288871. The reversal of 81288858 is 85888218.

It is not an unprimeable number, because it can be changed into a prime (81288853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10191 + ... + 16322.

It is an arithmetic number, because the mean of its divisors is an integer number (5886108).

Almost surely, 2^81288858 is an apocalyptic number.

81288858 is an abundant number, since it is smaller than the sum of its proper divisors (107066598).

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

81288858 is a wasteful number, since it uses less digits than its factorization.

81288858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26598.

The product of its digits is 327680, while the sum is 48.

The square root of 81288858 is about 9016.0333850314. The cubic root of 81288858 is about 433.1885884746.

The spelling of 81288858 in words is "eighty-one million, two hundred eighty-eight thousand, eight hundred fifty-eight".