442668136 has 8 divisors (see below), whose sum is σ = 830002770. Its totient is φ = 221334064.

The previous prime is 442668113. The next prime is 442668139. The reversal of 442668136 is 631866244.

It can be written as a sum of positive squares in only one way, i.e., 441252036 + 1416100 = 21006^2 + 1190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (442668139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27666751 + ... + 27666766.

Almost surely, 2^442668136 is an apocalyptic number.

It is an amenable number.

442668136 is a deficient number, since it is larger than the sum of its proper divisors (387334634).

442668136 is a wasteful number, since it uses less digits than its factorization.

442668136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55333523 (or 55333519 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 442668136 is about 21039.6800355899. The cubic root of 442668136 is about 762.1247881090.

The spelling of 442668136 in words is "four hundred forty-two million, six hundred sixty-eight thousand, one hundred thirty-six".