426668440 has 64 divisors (see below), whose sum is σ = 1057756320. Its totient is φ = 153600000.

The previous prime is 426668413. The next prime is 426668477. The reversal of 426668440 is 44866624.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 426668393 and 426668402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39640 + ... + 49240.

Almost surely, 2^426668440 is an apocalyptic number.

426668440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426668440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528878160).

426668440 is an abundant number, since it is smaller than the sum of its proper divisors (631087880).

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

426668440 is a wasteful number, since it uses less digits than its factorization.

426668440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9724 (or 9720 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 426668440 is about 20655.9541052937. The cubic root of 426668440 is about 752.8298660850.

It can be divided in two parts, 426 and 668440, that added together give a palindrome (668866).

The spelling of 426668440 in words is "four hundred twenty-six million, six hundred sixty-eight thousand, four hundred forty".