67638133 has 4 divisors (see below), whose sum is σ = 68131980. Its totient is φ = 67144288.

The previous prime is 67638107. The next prime is 67638149. The reversal of 67638133 is 33183676.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14085009 + 53553124 = 3753^2 + 7318^2 .

It is a cyclic number.

It is not a de Polignac number, because 67638133 - 2⁹ = 67637621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67638092 and 67638101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67638833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246718 + ... + 246991.

It is an arithmetic number, because the mean of its divisors is an integer number (17032995).

Almost surely, 2^67638133 is an apocalyptic number.

It is an amenable number.

67638133 is a deficient number, since it is larger than the sum of its proper divisors (493847).

67638133 is a wasteful number, since it uses less digits than its factorization.

67638133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493846.

The product of its digits is 54432, while the sum is 37.

The square root of 67638133 is about 8224.2405728432. The cubic root of 67638133 is about 407.4401944676.

It can be divided in two parts, 676 and 38133, that added together give a square (38809 = 197²).

The spelling of 67638133 in words is "sixty-seven million, six hundred thirty-eight thousand, one hundred thirty-three".