428640398 has 4 divisors (see below), whose sum is σ = 642960600. Its totient is φ = 214320198.

The previous prime is 428640391. The next prime is 428640409. The reversal of 428640398 is 893046824.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428640391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107160098 + ... + 107160101.

It is an arithmetic number, because the mean of its divisors is an integer number (160740150).

Almost surely, 2^428640398 is an apocalyptic number.

428640398 is a deficient number, since it is larger than the sum of its proper divisors (214320202).

428640398 is a wasteful number, since it uses less digits than its factorization.

428640398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214320201.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 428640398 is about 20703.6324832141. The cubic root of 428640398 is about 753.9878828786.

The spelling of 428640398 in words is "four hundred twenty-eight million, six hundred forty thousand, three hundred ninety-eight".