426442644 has 72 divisors (see below), whose sum is σ = 1124218368. Its totient is φ = 141341760.

The previous prime is 426442633. The next prime is 426442693. The reversal of 426442644 is 446244624.

426442644 is a `hidden beast` number, since 4 + 2 + 6 + 4 + 4 + 2 + 644 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 426442599 and 426442608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184504 + ... + 186800.

It is an arithmetic number, because the mean of its divisors is an integer number (15614144).

Almost surely, 2^426442644 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 426442644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562109184).

426442644 is an abundant number, since it is smaller than the sum of its proper divisors (697775724).

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

426442644 is a wasteful number, since it uses less digits than its factorization.

426442644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2493 counting only the distinct ones).

The product of its digits is 147456, while the sum is 36.

The square root of 426442644 is about 20650.4877424239. The cubic root of 426442644 is about 752.6970416627.

The spelling of 426442644 in words is "four hundred twenty-six million, four hundred forty-two thousand, six hundred forty-four".