81862460 has 24 divisors (see below), whose sum is σ = 172138176. Its totient is φ = 32701760.

The previous prime is 81862457. The next prime is 81862477. The reversal of 81862460 is 6426818.

It is a self number, because there is not a number n which added to its sum of digits gives 81862460.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15974 + ... + 20466.

It is an arithmetic number, because the mean of its divisors is an integer number (7172424).

Almost surely, 2^81862460 is an apocalyptic number.

It is an amenable number.

81862460 is an abundant number, since it is smaller than the sum of its proper divisors (90275716).

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

81862460 is a wasteful number, since it uses less digits than its factorization.

81862460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413 (or 5411 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 81862460 is about 9047.7875748715. The cubic root of 81862460 is about 434.2051102097.

The spelling of 81862460 in words is "eighty-one million, eight hundred sixty-two thousand, four hundred sixty".