669147140 has 24 divisors (see below), whose sum is σ = 1405745880. Its totient is φ = 267556608.

The previous prime is 669147137. The next prime is 669147161. The reversal of 669147140 is 41741966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17774656 + 651372484 = 4216^2 + 25522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 669147094 and 669147103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68906 + ... + 78014.

It is an arithmetic number, because the mean of its divisors is an integer number (58572745).

Almost surely, 2^669147140 is an apocalyptic number.

It is an amenable number.

669147140 is an abundant number, since it is smaller than the sum of its proper divisors (736598740).

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

669147140 is a wasteful number, since it uses less digits than its factorization.

669147140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12791 (or 12789 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 669147140 is about 25867.8785369036. The cubic root of 669147140 is about 874.6625703005.

The spelling of 669147140 in words is "six hundred sixty-nine million, one hundred forty-seven thousand, one hundred forty".