81887502 has 8 divisors (see below), whose sum is σ = 163775016. Its totient is φ = 27295832.

The previous prime is 81887501. The next prime is 81887513. The reversal of 81887502 is 20578818.

It is a sphenic number, since it is the product of 3 distinct primes.

81887502 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81887501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6823953 + ... + 6823964.

It is an arithmetic number, because the mean of its divisors is an integer number (20471877).

Almost surely, 2^81887502 is an apocalyptic number.

81887502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81887502 is a wasteful number, since it uses less digits than its factorization.

81887502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13647922.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 81887502 is about 9049.1713432778. The cubic root of 81887502 is about 434.2493806271.

The spelling of 81887502 in words is "eighty-one million, eight hundred eighty-seven thousand, five hundred two".