667400774 has 4 divisors (see below), whose sum is σ = 1001101164. Its totient is φ = 333700386.

The previous prime is 667400771. The next prime is 667400779. The reversal of 667400774 is 477004766.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667400771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166850192 + ... + 166850195.

It is an arithmetic number, because the mean of its divisors is an integer number (250275291).

Almost surely, 2^667400774 is an apocalyptic number.

667400774 is a deficient number, since it is larger than the sum of its proper divisors (333700390).

667400774 is a wasteful number, since it uses less digits than its factorization.

667400774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333700389.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 667400774 is about 25834.1009907448. The cubic root of 667400774 is about 873.9009980249.

The spelling of 667400774 in words is "six hundred sixty-seven million, four hundred thousand, seven hundred seventy-four".