428404660 has 12 divisors (see below), whose sum is σ = 899649828. Its totient is φ = 171361856.

The previous prime is 428404649. The next prime is 428404679. The reversal of 428404660 is 66404824.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 339517476 + 88887184 = 18426^2 + 9428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10710097 + ... + 10710136.

It is an arithmetic number, because the mean of its divisors is an integer number (74970819).

Almost surely, 2^428404660 is an apocalyptic number.

It is an amenable number.

428404660 is an abundant number, since it is smaller than the sum of its proper divisors (471245168).

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

428404660 is a wasteful number, since it uses less digits than its factorization.

428404660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21420242 (or 21420240 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 428404660 is about 20697.9385446957. The cubic root of 428404660 is about 753.8496347568.

The spelling of 428404660 in words is "four hundred twenty-eight million, four hundred four thousand, six hundred sixty".