81156528 has 30 divisors (see below), whose sum is σ = 227125964. Its totient is φ = 27052128.

The previous prime is 81156499. The next prime is 81156533. The reversal of 81156528 is 82565118.

81156528 = 1577² + 1578² + ... + 1608².

81156528 is a `hidden beast` number, since 81 + 1 + 56 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 81156492 and 81156501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281650 + ... + 281937.

Almost surely, 2^81156528 is an apocalyptic number.

It is an amenable number.

81156528 is an abundant number, since it is smaller than the sum of its proper divisors (145969436).

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

81156528 is a wasteful number, since it uses less digits than its factorization.

81156528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563601 (or 563592 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 81156528 is about 9008.6918029201. The cubic root of 81156528 is about 432.9533984733.

The spelling of 81156528 in words is "eighty-one million, one hundred fifty-six thousand, five hundred twenty-eight".