81768528 has 60 divisors (see below), whose sum is σ = 237325088. Its totient is φ = 27254880.

The previous prime is 81768517. The next prime is 81768551. The reversal of 81768528 is 82586718.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 6628 + ... + 14403.

Almost surely, 2^81768528 is an apocalyptic number.

It is an amenable number.

81768528 is an abundant number, since it is smaller than the sum of its proper divisors (155556560).

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

81768528 is a wasteful number, since it uses less digits than its factorization.

81768528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21054 (or 21036 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 81768528 is about 9042.5952027059. The cubic root of 81768528 is about 434.0389723403.

The spelling of 81768528 in words is "eighty-one million, seven hundred sixty-eight thousand, five hundred twenty-eight".