67878667 has 4 divisors (see below), whose sum is σ = 68027656. Its totient is φ = 67729680.

The previous prime is 67878661. The next prime is 67878689. The reversal of 67878667 is 76687876.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67878667 - 2¹⁹ = 67354379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67878661) 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, 73809 + ... + 74722.

It is an arithmetic number, because the mean of its divisors is an integer number (17006914).

Almost surely, 2^67878667 is an apocalyptic number.

67878667 is a deficient number, since it is larger than the sum of its proper divisors (148989).

67878667 is a wasteful number, since it uses less digits than its factorization.

67878667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148988.

The product of its digits is 4741632, while the sum is 55.

The square root of 67878667 is about 8238.8510728135. The cubic root of 67878667 is about 407.9226012191.

The spelling of 67878667 in words is "sixty-seven million, eight hundred seventy-eight thousand, six hundred sixty-seven".