428836666 has 4 divisors (see below), whose sum is σ = 643255002. Its totient is φ = 214418332.

The previous prime is 428836657. The next prime is 428836691. The reversal of 428836666 is 666638824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 246019225 + 182817441 = 15685^2 + 13521^2 .

It is a super-2 number, since 2×428836666² = 367801772211991112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107209165 + ... + 107209168.

Almost surely, 2^428836666 is an apocalyptic number.

428836666 is a deficient number, since it is larger than the sum of its proper divisors (214418336).

428836666 is a wasteful number, since it uses less digits than its factorization.

428836666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214418335.

The product of its digits is 1990656, while the sum is 49.

The square root of 428836666 is about 20708.3718819225. The cubic root of 428836666 is about 754.1029452275.

The spelling of 428836666 in words is "four hundred twenty-eight million, eight hundred thirty-six thousand, six hundred sixty-six".