81256238 has 8 divisors (see below), whose sum is σ = 139296432. Its totient is φ = 34824096.

The previous prime is 81256229. The next prime is 81256247. The reversal of 81256238 is 83265218.

It is an interprime number because it is at equal distance from previous prime (81256229) and next prime (81256247).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81256198 and 81256207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2901995 + ... + 2902022.

It is an arithmetic number, because the mean of its divisors is an integer number (17412054).

Almost surely, 2^81256238 is an apocalyptic number.

81256238 is a deficient number, since it is larger than the sum of its proper divisors (58040194).

81256238 is a wasteful number, since it uses less digits than its factorization.

81256238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5804026.

The product of its digits is 23040, while the sum is 35.

The square root of 81256238 is about 9014.2242040011. The cubic root of 81256238 is about 433.1306366935.

The spelling of 81256238 in words is "eighty-one million, two hundred fifty-six thousand, two hundred thirty-eight".