669106820 has 24 divisors (see below), whose sum is σ = 1419040728. Its totient is φ = 264992000.

The previous prime is 669106819. The next prime is 669106843. The reversal of 669106820 is 28601966.

It can be written as a sum of positive squares in 4 ways, for example, as 61089856 + 608016964 = 7816^2 + 24658^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163601 + ... + 167640.

It is an arithmetic number, because the mean of its divisors is an integer number (59126697).

Almost surely, 2^669106820 is an apocalyptic number.

It is an amenable number.

669106820 is an abundant number, since it is smaller than the sum of its proper divisors (749933908).

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

669106820 is a wasteful number, since it uses less digits than its factorization.

669106820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331351 (or 331349 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 669106820 is about 25867.0991802328. The cubic root of 669106820 is about 874.6450021151.

The spelling of 669106820 in words is "six hundred sixty-nine million, one hundred six thousand, eight hundred twenty".