81292326 has 8 divisors (see below), whose sum is σ = 162584664. Its totient is φ = 27097440.

The previous prime is 81292273. The next prime is 81292331. The reversal of 81292326 is 62329218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81292326 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6774355 + ... + 6774366.

It is an arithmetic number, because the mean of its divisors is an integer number (20323083).

Almost surely, 2^81292326 is an apocalyptic number.

81292326 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81292326 is a wasteful number, since it uses less digits than its factorization.

81292326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13548726.

The product of its digits is 10368, while the sum is 33.

The square root of 81292326 is about 9016.2257070240. The cubic root of 81292326 is about 433.1947487148.

It can be divided in two parts, 81292 and 326, that added together give a palindrome (81618).

The spelling of 81292326 in words is "eighty-one million, two hundred ninety-two thousand, three hundred twenty-six".