81201528 has 40 divisors (see below), whose sum is σ = 227441280. Its totient is φ = 27066960.

The previous prime is 81201511. The next prime is 81201539. The reversal of 81201528 is 82510218.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 9 ways as a sum of consecutive naturals, for example, 62008 + ... + 63303.

It is an arithmetic number, because the mean of its divisors is an integer number (5686032).

Almost surely, 2^81201528 is an apocalyptic number.

It is an amenable number.

81201528 is an abundant number, since it is smaller than the sum of its proper divisors (146239752).

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

81201528 is a wasteful number, since it uses less digits than its factorization.

81201528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125329 (or 125316 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81201528 is about 9011.1890447377. The cubic root of 81201528 is about 433.0334056049.

The spelling of 81201528 in words is "eighty-one million, two hundred one thousand, five hundred twenty-eight".