67406779 has 4 divisors (see below), whose sum is σ = 73534680. Its totient is φ = 61278880.

The previous prime is 67406777. The next prime is 67406783. The reversal of 67406779 is 97760476.

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 67406779 - 2¹ = 67406777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67406771) 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, 3063934 + ... + 3063955.

It is an arithmetic number, because the mean of its divisors is an integer number (18383670).

Almost surely, 2^67406779 is an apocalyptic number.

67406779 is a deficient number, since it is larger than the sum of its proper divisors (6127901).

67406779 is a wasteful number, since it uses less digits than its factorization.

67406779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127900.

The product of its (nonzero) digits is 444528, while the sum is 46.

The square root of 67406779 is about 8210.1631530683. The cubic root of 67406779 is about 406.9751185622.

The spelling of 67406779 in words is "sixty-seven million, four hundred six thousand, seven hundred seventy-nine".