428725188 has 36 divisors (see below), whose sum is σ = 1085774508. Its totient is φ = 142637760.

The previous prime is 428725181. The next prime is 428725217. The reversal of 428725188 is 881527824.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 234457344 + 194267844 = 15312^2 + 13938^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (428725181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8470 + ... + 30482.

It is an arithmetic number, because the mean of its divisors is an integer number (30160403).

Almost surely, 2^428725188 is an apocalyptic number.

It is an amenable number.

428725188 is an abundant number, since it is smaller than the sum of its proper divisors (657049320).

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

428725188 is a wasteful number, since it uses less digits than its factorization.

428725188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22564 (or 22559 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 428725188 is about 20705.6800902554. The cubic root of 428725188 is about 754.0375954255.

The spelling of 428725188 in words is "four hundred twenty-eight million, seven hundred twenty-five thousand, one hundred eighty-eight".