81525884 has 48 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 34755840.

The previous prime is 81525841. The next prime is 81525907. The reversal of 81525884 is 48852518.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94037 + ... + 94899.

It is an arithmetic number, because the mean of its divisors is an integer number (3447360).

Almost surely, 2^81525884 is an apocalyptic number.

It is an amenable number.

81525884 is an abundant number, since it is smaller than the sum of its proper divisors (83947396).

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

81525884 is a wasteful number, since it uses less digits than its factorization.

81525884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 1008 counting only the distinct ones).

The product of its digits is 102400, while the sum is 41.

The square root of 81525884 is about 9029.1685109981. The cubic root of 81525884 is about 433.6092173506.

The spelling of 81525884 in words is "eighty-one million, five hundred twenty-five thousand, eight hundred eighty-four".