428640396 has 24 divisors (see below), whose sum is σ = 1000674864. Its totient is φ = 142806720.

The previous prime is 428640391. The next prime is 428640409. The reversal of 428640396 is 693046824.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 18486 + ... + 34626.

It is an arithmetic number, because the mean of its divisors is an integer number (41694786).

Almost surely, 2^428640396 is an apocalyptic number.

It is an amenable number.

428640396 is an abundant number, since it is smaller than the sum of its proper divisors (572034468).

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

428640396 is a wasteful number, since it uses less digits than its factorization.

428640396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18361 (or 18359 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 428640396 is about 20703.6324349134. The cubic root of 428640396 is about 753.9878817060.

The spelling of 428640396 in words is "four hundred twenty-eight million, six hundred forty thousand, three hundred ninety-six".