668053784 has 16 divisors (see below), whose sum is σ = 1271297400. Its totient is φ = 329041152.

The previous prime is 668053703. The next prime is 668053787. The reversal of 668053784 is 487350866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668053787) 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, 622649 + ... + 623720.

Almost surely, 2^668053784 is an apocalyptic number.

It is an amenable number.

668053784 is a deficient number, since it is larger than the sum of its proper divisors (603243616).

668053784 is a wasteful number, since it uses less digits than its factorization.

668053784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246442 (or 1246438 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 668053784 is about 25846.7364284159. The cubic root of 668053784 is about 874.1859243109.

The spelling of 668053784 in words is "six hundred sixty-eight million, fifty-three thousand, seven hundred eighty-four".