667406744 has 8 divisors (see below), whose sum is σ = 1251387660. Its totient is φ = 333703368.

The previous prime is 667406743. The next prime is 667406771. The reversal of 667406744 is 447604766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 667406695 and 667406704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667406743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41712914 + ... + 41712929.

Almost surely, 2^667406744 is an apocalyptic number.

It is an amenable number.

667406744 is a deficient number, since it is larger than the sum of its proper divisors (583980916).

667406744 is a wasteful number, since it uses less digits than its factorization.

667406744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83425849 (or 83425845 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 44.

The square root of 667406744 is about 25834.2165354400. The cubic root of 667406744 is about 873.9036037423.

The spelling of 667406744 in words is "six hundred sixty-seven million, four hundred six thousand, seven hundred forty-four".