81495238 has 32 divisors (see below), whose sum is σ = 139618080. Its totient is φ = 35343360.

The previous prime is 81495223. The next prime is 81495247. The reversal of 81495238 is 83259418.

It is a self number, because there is not a number n which added to its sum of digits gives 81495238.

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 in 15 ways as a sum of consecutive naturals, for example, 42198 + ... + 44086.

It is an arithmetic number, because the mean of its divisors is an integer number (4363065).

Almost surely, 2^81495238 is an apocalyptic number.

81495238 is a deficient number, since it is larger than the sum of its proper divisors (58122842).

81495238 is a wasteful number, since it uses less digits than its factorization.

81495238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992.

The product of its digits is 69120, while the sum is 40.

The square root of 81495238 is about 9027.4712959942. The cubic root of 81495238 is about 433.5548785613.

The spelling of 81495238 in words is "eighty-one million, four hundred ninety-five thousand, two hundred thirty-eight".