81426279 has 32 divisors (see below), whose sum is σ = 125411328. Its totient is φ = 46508000.

The previous prime is 81426271. The next prime is 81426299. The reversal of 81426279 is 97262418.

It is not a de Polignac number, because 81426279 - 2³ = 81426271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81426271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53134 + ... + 54644.

It is an arithmetic number, because the mean of its divisors is an integer number (3919104).

Almost surely, 2^81426279 is an apocalyptic number.

81426279 is a deficient number, since it is larger than the sum of its proper divisors (43985049).

81426279 is a wasteful number, since it uses less digits than its factorization.

81426279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619.

The product of its digits is 48384, while the sum is 39.

The square root of 81426279 is about 9023.6510903292. The cubic root of 81426279 is about 433.4325566998.

The spelling of 81426279 in words is "eighty-one million, four hundred twenty-six thousand, two hundred seventy-nine".