844426428 has 24 divisors (see below), whose sum is σ = 1983381120. Its totient is φ = 279610800.

The previous prime is 844426423. The next prime is 844426433. The reversal of 844426428 is 824624448.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (844426423) and next prime (844426433).

It is a self number, because there is not a number n which added to its sum of digits gives 844426428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844426423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231198 + ... + 234821.

It is an arithmetic number, because the mean of its divisors is an integer number (82640880).

Almost surely, 2^844426428 is an apocalyptic number.

It is an amenable number.

844426428 is an abundant number, since it is smaller than the sum of its proper divisors (1138954692).

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

844426428 is a wasteful number, since it uses less digits than its factorization.

844426428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466177 (or 466175 counting only the distinct ones).

The product of its digits is 393216, while the sum is 42.

The square root of 844426428 is about 29059.0162944309. The cubic root of 844426428 is about 945.1932372674.

The spelling of 844426428 in words is "eight hundred forty-four million, four hundred twenty-six thousand, four hundred twenty-eight".