669740688 has 60 divisors (see below), whose sum is σ = 1878026748. Its totient is φ = 222808320.

The previous prime is 669740651. The next prime is 669740689. The reversal of 669740688 is 886047966.

It can be written as a sum of positive squares in 2 ways, for example, as 372798864 + 296941824 = 19308^2 + 17232^2 .

It is not an unprimeable number, because it can be changed into a prime (669740689) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 73606 + ... + 82202.

Almost surely, 2^669740688 is an apocalyptic number.

It is an amenable number.

669740688 is an abundant number, since it is smaller than the sum of its proper divisors (1208286060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669740688 is a wasteful number, since it uses less digits than its factorization.

669740688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9152 (or 9143 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 669740688 is about 25879.3486780483. The cubic root of 669740688 is about 874.9211087512.

The spelling of 669740688 in words is "six hundred sixty-nine million, seven hundred forty thousand, six hundred eighty-eight".