81358260 has 144 divisors (see below), whose sum is σ = 252237888. Its totient is φ = 19522560.

The previous prime is 81358219. The next prime is 81358271. The reversal of 81358260 is 6285318.

It is a happy number.

It is a hoax number, since the sum of its digits (33) 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 47 ways as a sum of consecutive naturals, for example, 980179 + ... + 980261.

It is an arithmetic number, because the mean of its divisors is an integer number (1751652).

Almost surely, 2^81358260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81358260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126118944).

81358260 is an abundant number, since it is smaller than the sum of its proper divisors (170879628).

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

81358260 is a wasteful number, since it uses less digits than its factorization.

81358260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81358260 is about 9019.8813739428. The cubic root of 81358260 is about 433.3118345679.

It can be divided in two parts, 81358 and 260, that added together give a palindrome (81618).

The spelling of 81358260 in words is "eighty-one million, three hundred fifty-eight thousand, two hundred sixty".