428863186 has 4 divisors (see below), whose sum is σ = 643294782. Its totient is φ = 214431592.

The previous prime is 428863163. The next prime is 428863249. The reversal of 428863186 is 681368824.

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., 381459961 + 47403225 = 19531^2 + 6885^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107215795 + ... + 107215798.

Almost surely, 2^428863186 is an apocalyptic number.

428863186 is a deficient number, since it is larger than the sum of its proper divisors (214431596).

428863186 is a wasteful number, since it uses less digits than its factorization.

428863186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214431595.

The product of its digits is 442368, while the sum is 46.

The square root of 428863186 is about 20709.0121927628. The cubic root of 428863186 is about 754.1184899165.

The spelling of 428863186 in words is "four hundred twenty-eight million, eight hundred sixty-three thousand, one hundred eighty-six".