81595088 has 20 divisors (see below), whose sum is σ = 158265540. Its totient is φ = 40752384.

The previous prime is 81595061. The next prime is 81595103. The reversal of 81595088 is 88059518.

It is a Cunningham number, because it is equal to 9033²-1.

It can be written as a sum of positive squares in 2 ways, for example, as 2598544 + 78996544 = 1612^2 + 8888^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15806 + ... + 20322.

It is an arithmetic number, because the mean of its divisors is an integer number (7913277).

Almost surely, 2^81595088 is an apocalyptic number.

It is an amenable number.

81595088 is a deficient number, since it is larger than the sum of its proper divisors (76670452).

81595088 is a wasteful number, since it uses less digits than its factorization.

81595088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5654 (or 5648 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 81595088 is about 9032.9999446474. Note that the first 4 decimals coincide. The cubic root of 81595088 is about 433.7318737148.

The spelling of 81595088 in words is "eighty-one million, five hundred ninety-five thousand, eighty-eight".