81259908 has 24 divisors (see below), whose sum is σ = 189893760. Its totient is φ = 27045600.

The previous prime is 81259891. The next prime is 81259921. The reversal of 81259908 is 80995218.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81259908.

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, 3733 + ... + 13283.

It is an arithmetic number, because the mean of its divisors is an integer number (7912240).

Almost surely, 2^81259908 is an apocalyptic number.

It is an amenable number.

81259908 is an abundant number, since it is smaller than the sum of its proper divisors (108633852).

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

81259908 is a wasteful number, since it uses less digits than its factorization.

81259908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10267 (or 10265 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 81259908 is about 9014.4277688603. The cubic root of 81259908 is about 433.1371574873.

The spelling of 81259908 in words is "eighty-one million, two hundred fifty-nine thousand, nine hundred eight".