666428460 has 48 divisors (see below), whose sum is σ = 1916438496. Its totient is φ = 172910592.

The previous prime is 666428447. The next prime is 666428479. The reversal of 666428460 is 64824666.

666428460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147877 + ... + 152316.

It is an arithmetic number, because the mean of its divisors is an integer number (39925802).

Almost surely, 2^666428460 is an apocalyptic number.

666428460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666428460 is an abundant number, since it is smaller than the sum of its proper divisors (1250010036).

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

666428460 is a wasteful number, since it uses less digits than its factorization.

666428460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300242 (or 300240 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 666428460 is about 25815.2757103231. The cubic root of 666428460 is about 873.4764059963.

The spelling of 666428460 in words is "six hundred sixty-six million, four hundred twenty-eight thousand, four hundred sixty".