81868862 has 4 divisors (see below), whose sum is σ = 122803296. Its totient is φ = 40934430.

The previous prime is 81868859. The next prime is 81868879. The reversal of 81868862 is 26886818.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 20467214 + ... + 20467217.

It is an arithmetic number, because the mean of its divisors is an integer number (30700824).

Almost surely, 2^81868862 is an apocalyptic number.

81868862 is a deficient number, since it is larger than the sum of its proper divisors (40934434).

81868862 is a wasteful number, since it uses less digits than its factorization.

81868862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40934433.

The product of its digits is 294912, while the sum is 47.

The square root of 81868862 is about 9048.1413561018. The cubic root of 81868862 is about 434.2164288233.

The spelling of 81868862 in words is "eighty-one million, eight hundred sixty-eight thousand, eight hundred sixty-two".