81239950 has 24 divisors (see below), whose sum is σ = 164844360. Its totient is φ = 29541600.

The previous prime is 81239947. The next prime is 81239969. The reversal of 81239950 is 5993218.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73305 + ... + 74404.

It is an arithmetic number, because the mean of its divisors is an integer number (6868515).

Almost surely, 2^81239950 is an apocalyptic number.

81239950 is an abundant number, since it is smaller than the sum of its proper divisors (83604410).

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

81239950 is a wasteful number, since it uses less digits than its factorization.

81239950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147732 (or 147727 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 81239950 is about 9013.3206977229. The cubic root of 81239950 is about 433.1016940818.

The spelling of 81239950 in words is "eighty-one million, two hundred thirty-nine thousand, nine hundred fifty".