81885828 has 12 divisors (see below), whose sum is σ = 191066960. Its totient is φ = 27295272.

The previous prime is 81885799. The next prime is 81885841. The reversal of 81885828 is 82858818.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411898 + ... + 3411921.

Almost surely, 2^81885828 is an apocalyptic number.

It is an amenable number.

81885828 is an abundant number, since it is smaller than the sum of its proper divisors (109181132).

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

81885828 is a wasteful number, since it uses less digits than its factorization.

81885828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823826 (or 6823824 counting only the distinct ones).

The product of its digits is 327680, while the sum is 48.

The square root of 81885828 is about 9049.0788481480. The cubic root of 81885828 is about 434.2464215332.

The spelling of 81885828 in words is "eighty-one million, eight hundred eighty-five thousand, eight hundred twenty-eight".