81426280 has 32 divisors (see below), whose sum is σ = 197303400. Its totient is φ = 30064896.

The previous prime is 81426271. The next prime is 81426299. The reversal of 81426280 is 8262418.

It can be written as a sum of positive squares in 4 ways, for example, as 66879684 + 14546596 = 8178^2 + 3814^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77775 + ... + 78814.

Almost surely, 2^81426280 is an apocalyptic number.

It is an amenable number.

81426280 is an abundant number, since it is smaller than the sum of its proper divisors (115877120).

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

81426280 is a wasteful number, since it uses less digits than its factorization.

81426280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156613 (or 156609 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 81426280 is about 9023.6511457392. The cubic root of 81426280 is about 433.4325584742.

Adding to 81426280 its reverse (8262418), we get a palindrome (89688698).

The spelling of 81426280 in words is "eighty-one million, four hundred twenty-six thousand, two hundred eighty".