428280666 has 16 divisors (see below), whose sum is σ = 934430688. Its totient is φ = 129782000.

The previous prime is 428280649. The next prime is 428280679. The reversal of 428280666 is 666082824.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244485 + ... + 3244616.

It is an arithmetic number, because the mean of its divisors is an integer number (58401918).

Almost surely, 2^428280666 is an apocalyptic number.

428280666 is an abundant number, since it is smaller than the sum of its proper divisors (506150022).

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

428280666 is a wasteful number, since it uses less digits than its factorization.

428280666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6489117.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 428280666 is about 20694.9430054784. The cubic root of 428280666 is about 753.7768983468.

It can be divided in two parts, 4282 and 80666, that added together give a palindrome (84948).

The spelling of 428280666 in words is "four hundred twenty-eight million, two hundred eighty thousand, six hundred sixty-six".