81126567428 has 12 divisors (see below), whose sum is σ = 142473161040. Its totient is φ = 40419949992.

The previous prime is 81126567427. The next prime is 81126567461. The reversal of 81126567428 is 82476562118.

It is not an unprimeable number, because it can be changed into a prime (81126567421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35832158 + ... + 35834421.

It is an arithmetic number, because the mean of its divisors is an integer number (11872763420).

Almost surely, 2^81126567428 is an apocalyptic number.

It is an amenable number.

81126567428 is a deficient number, since it is larger than the sum of its proper divisors (61346593612).

81126567428 is a wasteful number, since it uses less digits than its factorization.

81126567428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71666866 (or 71666864 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The spelling of 81126567428 in words is "eighty-one billion, one hundred twenty-six million, five hundred sixty-seven thousand, four hundred twenty-eight".