81857254 has 8 divisors (see below), whose sum is σ = 122826600. Its totient is φ = 40915056.

The previous prime is 81857231. The next prime is 81857273. The reversal of 81857254 is 45275818.

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

It is a super-2 number, since 2×81857254² = 13401220064841032, which contains 22 as substring.

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, 4522 + ... + 13570.

It is an arithmetic number, because the mean of its divisors is an integer number (15353325).

Almost surely, 2^81857254 is an apocalyptic number.

81857254 is a deficient number, since it is larger than the sum of its proper divisors (40969346).

81857254 is a wasteful number, since it uses less digits than its factorization.

81857254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13574.

The product of its digits is 89600, while the sum is 40.

The square root of 81857254 is about 9047.4998756563. The cubic root of 81857254 is about 434.1959056662.

The spelling of 81857254 in words is "eighty-one million, eight hundred fifty-seven thousand, two hundred fifty-four".