81423286 has 16 divisors (see below), whose sum is σ = 139700736. Its totient is φ = 34866216.

The previous prime is 81423283. The next prime is 81423299. The reversal of 81423286 is 68232418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81423283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26355 + ... + 29281.

It is an arithmetic number, because the mean of its divisors is an integer number (8731296).

Almost surely, 2^81423286 is an apocalyptic number.

81423286 is a deficient number, since it is larger than the sum of its proper divisors (58277450).

81423286 is a wasteful number, since it uses less digits than its factorization.

81423286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923.

The product of its digits is 18432, while the sum is 34.

The square root of 81423286 is about 9023.4852468434. The cubic root of 81423286 is about 433.4272460493.

The spelling of 81423286 in words is "eighty-one million, four hundred twenty-three thousand, two hundred eighty-six".