81290426 has 16 divisors (see below), whose sum is σ = 139476480. Its totient is φ = 34808400.

The previous prime is 81290411. The next prime is 81290437. The reversal of 81290426 is 62409218.

It is a super-2 number, since 2×81290426² = 13216266718522952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81290392 and 81290401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22976 + ... + 26276.

It is an arithmetic number, because the mean of its divisors is an integer number (8717280).

Almost surely, 2^81290426 is an apocalyptic number.

81290426 is a deficient number, since it is larger than the sum of its proper divisors (58186054).

81290426 is a wasteful number, since it uses less digits than its factorization.

81290426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 81290426 is about 9016.1203408118. The cubic root of 81290426 is about 433.1913737491.

The spelling of 81290426 in words is "eighty-one million, two hundred ninety thousand, four hundred twenty-six".