428686825 has 12 divisors (see below), whose sum is σ = 607510720. Its totient is φ = 293956560.

The previous prime is 428686799. The next prime is 428686883. The reversal of 428686825 is 528686824.

It is a happy number.

It is not a de Polignac number, because 428686825 - 2⁵ = 428686793 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1224645 + ... + 1224994.

Almost surely, 2^428686825 is an apocalyptic number.

It is an amenable number.

428686825 is a deficient number, since it is larger than the sum of its proper divisors (178823895).

428686825 is a wasteful number, since it uses less digits than its factorization.

428686825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449656 (or 2449651 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The square root of 428686825 is about 20704.7536812202. The cubic root of 428686825 is about 754.0151039337.

Subtracting 428686825 from its reverse (528686824), we obtain a palindrome (99999999).

The spelling of 428686825 in words is "four hundred twenty-eight million, six hundred eighty-six thousand, eight hundred twenty-five".