668587772 has 6 divisors (see below), whose sum is σ = 1170028608. Its totient is φ = 334293884.

The previous prime is 668587771. The next prime is 668587873. The reversal of 668587772 is 277785866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668587771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83573468 + ... + 83573475.

It is an arithmetic number, because the mean of its divisors is an integer number (195004768).

Almost surely, 2^668587772 is an apocalyptic number.

It is an amenable number.

668587772 is a deficient number, since it is larger than the sum of its proper divisors (501440836).

668587772 is a wasteful number, since it uses less digits than its factorization.

668587772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167146947 (or 167146945 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 56.

The square root of 668587772 is about 25857.0642571812. The cubic root of 668587772 is about 874.4187800502.

The spelling of 668587772 in words is "six hundred sixty-eight million, five hundred eighty-seven thousand, seven hundred seventy-two".