428374644 has 24 divisors (see below), whose sum is σ = 999915840. Its totient is φ = 142737984.

The previous prime is 428374637. The next prime is 428374679. The reversal of 428374644 is 446473824.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 428374596 and 428374605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39217 + ... + 48935.

It is an arithmetic number, because the mean of its divisors is an integer number (41663160).

Almost surely, 2^428374644 is an apocalyptic number.

It is an amenable number.

428374644 is an abundant number, since it is smaller than the sum of its proper divisors (571541196).

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

428374644 is a wasteful number, since it uses less digits than its factorization.

428374644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13399 (or 13397 counting only the distinct ones).

The product of its digits is 516096, while the sum is 42.

The square root of 428374644 is about 20697.2134356294. The cubic root of 428374644 is about 753.8320282886.

The spelling of 428374644 in words is "four hundred twenty-eight million, three hundred seventy-four thousand, six hundred forty-four".