667773774 has 16 divisors (see below), whose sum is σ = 1483941840. Its totient is φ = 222591240.

The previous prime is 667773773. The next prime is 667773797. The reversal of 667773774 is 477377766.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12366181 = 667773774 / (6 + 6 + 7 + 7 + 7 + 3 + 7 + 7 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 667773774.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667773773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6183037 + ... + 6183144.

It is an arithmetic number, because the mean of its divisors is an integer number (92746365).

Almost surely, 2^667773774 is an apocalyptic number.

667773774 is an abundant number, since it is smaller than the sum of its proper divisors (816168066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667773774 is a wasteful number, since it uses less digits than its factorization.

667773774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12366192 (or 12366186 counting only the distinct ones).

The product of its digits is 7260624, while the sum is 54.

The square root of 667773774 is about 25841.3191226764. The cubic root of 667773774 is about 874.0637709684.

The spelling of 667773774 in words is "six hundred sixty-seven million, seven hundred seventy-three thousand, seven hundred seventy-four".