428820425 has 12 divisors (see below), whose sum is σ = 580077456. Its totient is φ = 311869200.

The previous prime is 428820409. The next prime is 428820473. The reversal of 428820425 is 524028824.

It is not a de Polignac number, because 428820425 - 2⁴ = 428820409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 779399 + ... + 779948.

It is an arithmetic number, because the mean of its divisors is an integer number (48339788).

Almost surely, 2^428820425 is an apocalyptic number.

It is an amenable number.

428820425 is a deficient number, since it is larger than the sum of its proper divisors (151257031).

428820425 is a wasteful number, since it uses less digits than its factorization.

428820425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559368 (or 1559363 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 35.

The square root of 428820425 is about 20707.9797421187. The cubic root of 428820425 is about 754.0934252544.

The spelling of 428820425 in words is "four hundred twenty-eight million, eight hundred twenty thousand, four hundred twenty-five".