81355528 has 16 divisors (see below), whose sum is σ = 152758080. Its totient is φ = 40620048.

The previous prime is 81355493. The next prime is 81355541. The reversal of 81355528 is 82555318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900 + ... + 12787.

It is an arithmetic number, because the mean of its divisors is an integer number (9547380).

Almost surely, 2^81355528 is an apocalyptic number.

It is an amenable number.

81355528 is a deficient number, since it is larger than the sum of its proper divisors (71402552).

81355528 is a wasteful number, since it uses less digits than its factorization.

81355528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436 (or 14432 counting only the distinct ones).

The product of its digits is 48000, while the sum is 37.

The square root of 81355528 is about 9019.7299294380. The cubic root of 81355528 is about 433.3069843282.

The spelling of 81355528 in words is "eighty-one million, three hundred fifty-five thousand, five hundred twenty-eight".