669936788 has 6 divisors (see below), whose sum is σ = 1172389386. Its totient is φ = 334968392.

The previous prime is 669936779. The next prime is 669936829. The reversal of 669936788 is 887639966.

It can be written as a sum of positive squares in only one way, i.e., 510217744 + 159719044 = 22588^2 + 12638^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 669936788.

It is a congruent number.

It is an unprimeable number.

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, 83742095 + ... + 83742102.

It is an arithmetic number, because the mean of its divisors is an integer number (195398231).

Almost surely, 2^669936788 is an apocalyptic number.

It is an amenable number.

669936788 is a deficient number, since it is larger than the sum of its proper divisors (502452598).

669936788 is a wasteful number, since it uses less digits than its factorization.

669936788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167484201 (or 167484199 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 62.

The square root of 669936788 is about 25883.1371359810. The cubic root of 669936788 is about 875.0064926865.

The spelling of 669936788 in words is "six hundred sixty-nine million, nine hundred thirty-six thousand, seven hundred eighty-eight".