428772728 has 16 divisors (see below), whose sum is σ = 821054880. Its totient is φ = 209824768.

The previous prime is 428772709. The next prime is 428772733. The reversal of 428772728 is 827277824.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569801 + ... + 570552.

It is an arithmetic number, because the mean of its divisors is an integer number (51315930).

Almost surely, 2^428772728 is an apocalyptic number.

It is an amenable number.

428772728 is a deficient number, since it is larger than the sum of its proper divisors (392282152).

428772728 is a wasteful number, since it uses less digits than its factorization.

428772728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140406 (or 1140402 counting only the distinct ones).

The product of its digits is 702464, while the sum is 47.

The square root of 428772728 is about 20706.8280526014. The cubic root of 428772728 is about 754.0654653551.

The spelling of 428772728 in words is "four hundred twenty-eight million, seven hundred seventy-two thousand, seven hundred twenty-eight".