428801638 has 8 divisors (see below), whose sum is σ = 646036632. Its totient is φ = 213456096.

The previous prime is 428801609. The next prime is 428801647. The reversal of 428801638 is 836108824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 428801638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471795 + ... + 472702.

It is an arithmetic number, because the mean of its divisors is an integer number (80754579).

Almost surely, 2^428801638 is an apocalyptic number.

428801638 is a deficient number, since it is larger than the sum of its proper divisors (217234994).

428801638 is a wasteful number, since it uses less digits than its factorization.

428801638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944726.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 428801638 is about 20707.5261197469. The cubic root of 428801638 is about 754.0824125948.

The spelling of 428801638 in words is "four hundred twenty-eight million, eight hundred one thousand, six hundred thirty-eight".