428640394 has 32 divisors (see below), whose sum is σ = 797158656. Its totient is φ = 168324480.

The previous prime is 428640391. The next prime is 428640409. The reversal of 428640394 is 493046824.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16339 + ... + 33529.

It is an arithmetic number, because the mean of its divisors is an integer number (24911208).

Almost surely, 2^428640394 is an apocalyptic number.

428640394 is a deficient number, since it is larger than the sum of its proper divisors (368518262).

428640394 is a wasteful number, since it uses less digits than its factorization.

428640394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17350.

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 428640394 is about 20703.6323866127. The cubic root of 428640394 is about 753.9878805333.

The spelling of 428640394 in words is "four hundred twenty-eight million, six hundred forty thousand, three hundred ninety-four".