428020425 has 72 divisors (see below), whose sum is σ = 906459840. Its totient is φ = 188899200.

The previous prime is 428020349. The next prime is 428020427. The reversal of 428020425 is 524020824.

It is a happy number.

It is not a de Polignac number, because 428020425 - 2⁷ = 428020297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428020427) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40990 + ... + 50360.

It is an arithmetic number, because the mean of its divisors is an integer number (12589720).

Almost surely, 2^428020425 is an apocalyptic number.

428020425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

428020425 is an abundant number, since it is smaller than the sum of its proper divisors (478439415).

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

428020425 is a wasteful number, since it uses less digits than its factorization.

428020425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9423 (or 9415 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 428020425 is about 20688.6544995077. The cubic root of 428020425 is about 753.6241920997.

The spelling of 428020425 in words is "four hundred twenty-eight million, twenty thousand, four hundred twenty-five".