81300626 has 12 divisors (see below), whose sum is σ = 134045646. Its totient is φ = 36954720.

The previous prime is 81300623. The next prime is 81300697. The reversal of 81300626 is 62600318.

It can be written as a sum of positive squares in only one way, i.e., 75707401 + 5593225 = 8701^2 + 2365^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81300595 and 81300604.

It is not an unprimeable number, because it can be changed into a prime (81300623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167735 + ... + 168218.

Almost surely, 2^81300626 is an apocalyptic number.

81300626 is a deficient number, since it is larger than the sum of its proper divisors (52745020).

81300626 is a wasteful number, since it uses less digits than its factorization.

81300626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335977 (or 335966 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 81300626 is about 9016.6859765659. The cubic root of 81300626 is about 433.2094913694.

The spelling of 81300626 in words is "eighty-one million, three hundred thousand, six hundred twenty-six".