81887488 has 36 divisors (see below), whose sum is σ = 164460240. Its totient is φ = 40692224.

The previous prime is 81887479. The next prime is 81887501. The reversal of 81887488 is 88478818.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44931 + ... + 46717.

It is an arithmetic number, because the mean of its divisors is an integer number (4568340).

Almost surely, 2^81887488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81887488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82230120).

81887488 is an abundant number, since it is smaller than the sum of its proper divisors (82572752).

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

81887488 is a wasteful number, since it uses less digits than its factorization.

81887488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982 (or 1968 counting only the distinct ones).

The product of its digits is 917504, while the sum is 52.

The square root of 81887488 is about 9049.1705697263. The cubic root of 81887488 is about 434.2493558798.

The spelling of 81887488 in words is "eighty-one million, eight hundred eighty-seven thousand, four hundred eighty-eight".