428820426 has 16 divisors (see below), whose sum is σ = 952934400. Its totient is φ = 142940124.

The previous prime is 428820409. The next prime is 428820473. The reversal of 428820426 is 624028824.

It is a happy number.

428820426 is a `hidden beast` number, since 428 + 8 + 204 + 26 = 666.

It is a Curzon 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, 3970506 + ... + 3970613.

It is an arithmetic number, because the mean of its divisors is an integer number (59558400).

Almost surely, 2^428820426 is an apocalyptic number.

428820426 is an abundant number, since it is smaller than the sum of its proper divisors (524113974).

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

428820426 is a wasteful number, since it uses less digits than its factorization.

428820426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941130 (or 7941124 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 428820426 is about 20707.9797662640. The cubic root of 428820426 is about 754.0934258406.

The spelling of 428820426 in words is "four hundred twenty-eight million, eight hundred twenty thousand, four hundred twenty-six".