428621425 has 24 divisors (see below), whose sum is σ = 564546456. Its totient is φ = 321699840.

The previous prime is 428621359. The next prime is 428621429. The reversal of 428621425 is 524126824.

It can be written as a sum of positive squares in 12 ways, for example, as 49112064 + 379509361 = 7008^2 + 19481^2 .

It is not a de Polignac number, because 428621425 - 2¹⁷ = 428490353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428621429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148597 + ... + 151453.

It is an arithmetic number, because the mean of its divisors is an integer number (23522769).

Almost surely, 2^428621425 is an apocalyptic number.

It is an amenable number.

428621425 is a deficient number, since it is larger than the sum of its proper divisors (135925031).

428621425 is a wasteful number, since it uses less digits than its factorization.

428621425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237 (or 3232 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 428621425 is about 20703.1742735263. The cubic root of 428621425 is about 753.9767580731.

The spelling of 428621425 in words is "four hundred twenty-eight million, six hundred twenty-one thousand, four hundred twenty-five".