428340666 has 16 divisors (see below), whose sum is σ = 922580064. Its totient is φ = 131797104.

The previous prime is 428340659. The next prime is 428340677. The reversal of 428340666 is 666043824.

It is a super-2 number, since 2×428340666² = 366951452298647112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 2745696 + ... + 2745851.

It is an arithmetic number, because the mean of its divisors is an integer number (57661254).

Almost surely, 2^428340666 is an apocalyptic number.

428340666 is an abundant number, since it is smaller than the sum of its proper divisors (494239398).

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

428340666 is a wasteful number, since it uses less digits than its factorization.

428340666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491565.

The product of its (nonzero) digits is 165888, while the sum is 39.

The square root of 428340666 is about 20696.3925842162. The cubic root of 428340666 is about 753.8120968398.

The spelling of 428340666 in words is "four hundred twenty-eight million, three hundred forty thousand, six hundred sixty-six".