81426956 has 24 divisors (see below), whose sum is σ = 158411904. Its totient is φ = 36368640.

The previous prime is 81426937. The next prime is 81426971. The reversal of 81426956 is 65962418.

It is a happy number.

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, 23645 + ... + 26868.

It is an arithmetic number, because the mean of its divisors is an integer number (6600496).

Almost surely, 2^81426956 is an apocalyptic number.

It is an amenable number.

81426956 is a deficient number, since it is larger than the sum of its proper divisors (76984948).

81426956 is a wasteful number, since it uses less digits than its factorization.

81426956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50561 (or 50559 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 81426956 is about 9023.6886027832. The cubic root of 81426956 is about 433.4337579215.

The spelling of 81426956 in words is "eighty-one million, four hundred twenty-six thousand, nine hundred fifty-six".