81535692 has 48 divisors (see below), whose sum is σ = 217969920. Its totient is φ = 23237952.

The previous prime is 81535691. The next prime is 81535693. The reversal of 81535692 is 29653518.

It is an interprime number because it is at equal distance from previous prime (81535691) and next prime (81535693).

It is a self number, because there is not a number n which added to its sum of digits gives 81535692.

It is not an unprimeable number, because it can be changed into a prime (81535691) 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, 41803 + ... + 43709.

It is an arithmetic number, because the mean of its divisors is an integer number (4541040).

Almost surely, 2^81535692 is an apocalyptic number.

It is an amenable number.

81535692 is an abundant number, since it is smaller than the sum of its proper divisors (136434228).

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

81535692 is a wasteful number, since it uses less digits than its factorization.

81535692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430 (or 2428 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 81535692 is about 9029.7116233023. The cubic root of 81535692 is about 433.6266051562.

The spelling of 81535692 in words is "eighty-one million, five hundred thirty-five thousand, six hundred ninety-two".