81127838 has 24 divisors (see below), whose sum is σ = 134791776. Its totient is φ = 36592160.

The previous prime is 81127817. The next prime is 81127867. The reversal of 81127838 is 83872118.

It is a super-3 number, since 3×81127838³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31931 + ... + 34377.

It is an arithmetic number, because the mean of its divisors is an integer number (5616324).

Almost surely, 2^81127838 is an apocalyptic number.

81127838 is a deficient number, since it is larger than the sum of its proper divisors (53663938).

81127838 is a wasteful number, since it uses less digits than its factorization.

81127838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2597 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 81127838 is about 9007.0993110990. The cubic root of 81127838 is about 432.9023740422.

The spelling of 81127838 in words is "eighty-one million, one hundred twenty-seven thousand, eight hundred thirty-eight".