428000856 has 32 divisors (see below), whose sum is σ = 1080008640. Its totient is φ = 141332768.

The previous prime is 428000843. The next prime is 428000929. The reversal of 428000856 is 658000824.

It is a congruent 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, 80766 + ... + 85901.

It is an arithmetic number, because the mean of its divisors is an integer number (33750270).

Almost surely, 2^428000856 is an apocalyptic number.

It is an amenable number.

428000856 is an abundant number, since it is smaller than the sum of its proper divisors (652007784).

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

428000856 is a wasteful number, since it uses less digits than its factorization.

428000856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166783 (or 166779 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 428000856 is about 20688.1815537277. The cubic root of 428000856 is about 753.6127067470.

The spelling of 428000856 in words is "four hundred twenty-eight million, eight hundred fifty-six", and thus it is an aban number.