81825426 has 24 divisors (see below), whose sum is σ = 182081484. Its totient is φ = 26537760.

The previous prime is 81825413. The next prime is 81825427. The reversal of 81825426 is 62452818.

It can be written as a sum of positive squares in 2 ways, for example, as 58293225 + 23532201 = 7635^2 + 4851^2 .

It is not an unprimeable number, because it can be changed into a prime (81825427) 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 11 ways as a sum of consecutive naturals, for example, 60765 + ... + 62096.

Almost surely, 2^81825426 is an apocalyptic number.

81825426 is an abundant number, since it is smaller than the sum of its proper divisors (100256058).

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

81825426 is a wasteful number, since it uses less digits than its factorization.

81825426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122906 (or 122903 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 81825426 is about 9045.7407656864. The cubic root of 81825426 is about 434.1396232228.

It can be divided in two parts, 818 and 25426, that added together give a square (26244 = 162²).

The spelling of 81825426 in words is "eighty-one million, eight hundred twenty-five thousand, four hundred twenty-six".