81860284 has 24 divisors (see below), whose sum is σ = 164505600. Its totient is φ = 35250480.

The previous prime is 81860279. The next prime is 81860291. The reversal of 81860284 is 48206818.

It is a super-2 number, since 2×81860284² = 13402212193121312, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 48124 + ... + 49795.

It is an arithmetic number, because the mean of its divisors is an integer number (6854400).

Almost surely, 2^81860284 is an apocalyptic number.

It is an amenable number.

81860284 is an abundant number, since it is smaller than the sum of its proper divisors (82645316).

81860284 is a wasteful number, since it uses less digits than its factorization.

81860284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97953 (or 97951 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 81860284 is about 9047.6673236807. The cubic root of 81860284 is about 434.2012629489.

The spelling of 81860284 in words is "eighty-one million, eight hundred sixty thousand, two hundred eighty-four".