213866428 has 6 divisors (see below), whose sum is σ = 374266256. Its totient is φ = 106933212.

The previous prime is 213866407. The next prime is 213866447. The reversal of 213866428 is 824668312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26733300 + ... + 26733307.

Almost surely, 2^213866428 is an apocalyptic number.

It is an amenable number.

213866428 is a deficient number, since it is larger than the sum of its proper divisors (160399828).

213866428 is a wasteful number, since it uses less digits than its factorization.

213866428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53466611 (or 53466609 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 213866428 is about 14624.1727287392. The cubic root of 213866428 is about 598.0179299106.

The spelling of 213866428 in words is "two hundred thirteen million, eight hundred sixty-six thousand, four hundred twenty-eight".