428972785 has 16 divisors (see below), whose sum is σ = 560548800. Its totient is φ = 313903296.

The previous prime is 428972779. The next prime is 428972809. The reversal of 428972785 is 587279824.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 428972785 - 2³ = 428972777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75099 + ... + 80608.

It is an arithmetic number, because the mean of its divisors is an integer number (35034300).

Almost surely, 2^428972785 is an apocalyptic number.

It is an amenable number.

428972785 is a deficient number, since it is larger than the sum of its proper divisors (131576015).

428972785 is a wasteful number, since it uses less digits than its factorization.

428972785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155760.

The product of its digits is 2257920, while the sum is 52.

The square root of 428972785 is about 20711.6581904974. The cubic root of 428972785 is about 754.1827245376.

The spelling of 428972785 in words is "four hundred twenty-eight million, nine hundred seventy-two thousand, seven hundred eighty-five".