81858126 has 48 divisors (see below), whose sum is σ = 197033040. Its totient is φ = 22579200.

The previous prime is 81858109. The next prime is 81858131. The reversal of 81858126 is 62185818.

It is a hoax number, since the sum of its digits (39) 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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3726 + ... + 13326.

It is an arithmetic number, because the mean of its divisors is an integer number (4104855).

Almost surely, 2^81858126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81858126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98516520).

81858126 is an abundant number, since it is smaller than the sum of its proper divisors (115174914).

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

81858126 is a wasteful number, since it uses less digits than its factorization.

81858126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649 (or 9642 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 81858126 is about 9047.5480656363. The cubic root of 81858126 is about 434.1974474456.

It can be divided in two parts, 8185812 and 6, that added together give a palindrome (8185818).

The spelling of 81858126 in words is "eighty-one million, eight hundred fifty-eight thousand, one hundred twenty-six".