542668636 has 6 divisors (see below), whose sum is σ = 949670120. Its totient is φ = 271334316.

The previous prime is 542668597. The next prime is 542668663. The reversal of 542668636 is 636866245.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67833576 + ... + 67833583.

Almost surely, 2^542668636 is an apocalyptic number.

It is an amenable number.

542668636 is a deficient number, since it is larger than the sum of its proper divisors (407001484).

542668636 is a wasteful number, since it uses less digits than its factorization.

542668636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135667163 (or 135667161 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 46.

The square root of 542668636 is about 23295.2492152370. The cubic root of 542668636 is about 815.6645243267.

The spelling of 542668636 in words is "five hundred forty-two million, six hundred sixty-eight thousand, six hundred thirty-six".