81408862 has 16 divisors (see below), whose sum is σ = 125610912. Its totient is φ = 39546880.

The previous prime is 81408851. The next prime is 81408881. The reversal of 81408862 is 26880418.

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, 19143 + ... + 23005.

It is an arithmetic number, because the mean of its divisors is an integer number (7850682).

Almost surely, 2^81408862 is an apocalyptic number.

81408862 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81408862 is a deficient number, since it is larger than the sum of its proper divisors (44202050).

81408862 is a wasteful number, since it uses less digits than its factorization.

81408862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163.

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

The square root of 81408862 is about 9022.6859637250. The cubic root of 81408862 is about 433.4016508987.

The spelling of 81408862 in words is "eighty-one million, four hundred eight thousand, eight hundred sixty-two".