426512660 has 72 divisors (see below), whose sum is σ = 1103241384. Its totient is φ = 137625600.

The previous prime is 426512659. The next prime is 426512707. The reversal of 426512660 is 66215624.

It can be written as a sum of positive squares in 4 ways, for example, as 243235216 + 183277444 = 15596^2 + 13538^2 .

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3860 + ... + 29460.

It is an arithmetic number, because the mean of its divisors is an integer number (15322797).

Almost surely, 2^426512660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426512660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551620692).

426512660 is an abundant number, since it is smaller than the sum of its proper divisors (676728724).

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

426512660 is a wasteful number, since it uses less digits than its factorization.

426512660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641 (or 25632 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 426512660 is about 20652.1829354671. The cubic root of 426512660 is about 752.7382335657.

The spelling of 426512660 in words is "four hundred twenty-six million, five hundred twelve thousand, six hundred sixty".