81228990010 has 24 divisors (see below), whose sum is σ = 170083559700. Its totient is φ = 27849939264.

The previous prime is 81228989987. The next prime is 81228990041. The reversal of 81228990010 is 1009982218.

It can be written as a sum of positive squares in 2 ways, for example, as 78985167849 + 2243822161 = 281043^2 + 47369^2 .

It is a super-3 number, since 3×81228990010³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82886235 + ... + 82887214.

Almost surely, 2^81228990010 is an apocalyptic number.

81228990010 is an abundant number, since it is smaller than the sum of its proper divisors (88854569690).

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

81228990010 is a wasteful number, since it uses less digits than its factorization.

81228990010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165773470 (or 165773463 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 81228990010 in words is "eighty-one billion, two hundred twenty-eight million, nine hundred ninety thousand, ten".