81028765122 has 32 divisors (see below), whose sum is σ = 162522847872. Its totient is φ = 26932141824.

The previous prime is 81028765087. The next prime is 81028765127. The reversal of 81028765122 is 22156782018.

It is not an unprimeable number, because it can be changed into a prime (81028765127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3219178 + ... + 3244250.

It is an arithmetic number, because the mean of its divisors is an integer number (5078838996).

Almost surely, 2^81028765122 is an apocalyptic number.

81028765122 is an abundant number, since it is smaller than the sum of its proper divisors (81494082750).

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

81028765122 is a wasteful number, since it uses less digits than its factorization.

81028765122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26602.

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 81028765122 in words is "eighty-one billion, twenty-eight million, seven hundred sixty-five thousand, one hundred twenty-two".