669947984 has 20 divisors (see below), whose sum is σ = 1322516916. Its totient is φ = 328653312.

The previous prime is 669947983. The next prime is 669948001. The reversal of 669947984 is 489749966.

669947984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 191213584 + 478734400 = 13828^2 + 21880^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669947983) 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, 394169 + ... + 395864.

Almost surely, 2^669947984 is an apocalyptic number.

It is an amenable number.

669947984 is a deficient number, since it is larger than the sum of its proper divisors (652568932).

669947984 is a wasteful number, since it uses less digits than its factorization.

669947984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790094 (or 790088 counting only the distinct ones).

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

The square root of 669947984 is about 25883.3534148881. The cubic root of 669947984 is about 875.0113670360.

The spelling of 669947984 in words is "six hundred sixty-nine million, nine hundred forty-seven thousand, nine hundred eighty-four".