81426330 has 32 divisors (see below), whose sum is σ = 217137600. Its totient is φ = 21713616.

The previous prime is 81426299. The next prime is 81426337. The reversal of 81426330 is 3362418.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 81426294 and 81426303.

It is not an unprimeable number, because it can be changed into a prime (81426337) 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, 150520 + ... + 151059.

It is an arithmetic number, because the mean of its divisors is an integer number (6785550).

Almost surely, 2^81426330 is an apocalyptic number.

81426330 is an abundant number, since it is smaller than the sum of its proper divisors (135711270).

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

81426330 is a wasteful number, since it uses less digits than its factorization.

81426330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301595 (or 301589 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 81426330 is about 9023.6539162359. The cubic root of 81426330 is about 433.4326471909.

Adding to 81426330 its reverse (3362418), we get a palindrome (84788748).

The spelling of 81426330 in words is "eighty-one million, four hundred twenty-six thousand, three hundred thirty".