81589242 has 32 divisors (see below), whose sum is σ = 187189632. Its totient is φ = 23223744.

The previous prime is 81589231. The next prime is 81589259. The reversal of 81589242 is 24298518.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 81589242.

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, 8128 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (5849676).

Almost surely, 2^81589242 is an apocalyptic number.

81589242 is an abundant number, since it is smaller than the sum of its proper divisors (105600390).

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

81589242 is a wasteful number, since it uses less digits than its factorization.

81589242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7302.

The product of its digits is 46080, while the sum is 39.

The square root of 81589242 is about 9032.6763475727. The cubic root of 81589242 is about 433.7215150149.

The spelling of 81589242 in words is "eighty-one million, five hundred eighty-nine thousand, two hundred forty-two".