81126306 has 32 divisors (see below), whose sum is σ = 180722880. Its totient is φ = 26975808.

The previous prime is 81126301. The next prime is 81126307. The reversal of 81126306 is 60362118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81126306.

It is not an unprimeable number, because it can be changed into a prime (81126301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23610 + ... + 26826.

It is an arithmetic number, because the mean of its divisors is an integer number (5647590).

Almost surely, 2^81126306 is an apocalyptic number.

81126306 is an abundant number, since it is smaller than the sum of its proper divisors (99596574).

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

81126306 is a wasteful number, since it uses less digits than its factorization.

81126306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695 (or 3689 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81126306 is about 9007.0142666702. The cubic root of 81126306 is about 432.8996490811.

The spelling of 81126306 in words is "eighty-one million, one hundred twenty-six thousand, three hundred six".