81295584 has 48 divisors (see below), whose sum is σ = 220767120. Its totient is φ = 26163200.

The previous prime is 81295573. The next prime is 81295597. The reversal of 81295584 is 48559218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11817 + ... + 17384.

It is an arithmetic number, because the mean of its divisors is an integer number (4599315).

Almost surely, 2^81295584 is an apocalyptic number.

It is an amenable number.

81295584 is an abundant number, since it is smaller than the sum of its proper divisors (139471536).

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

81295584 is a wasteful number, since it uses less digits than its factorization.

81295584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29243 (or 29235 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 81295584 is about 9016.4063794840. The cubic root of 81295584 is about 433.2005357704.

The spelling of 81295584 in words is "eighty-one million, two hundred ninety-five thousand, five hundred eighty-four".