669307028 has 24 divisors (see below), whose sum is σ = 1262100840. Its totient is φ = 308736000.

The previous prime is 669307027. The next prime is 669307043. The reversal of 669307028 is 820703966.

It can be written as a sum of positive squares in 4 ways, for example, as 146361604 + 522945424 = 12098^2 + 22868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669307021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153908 + ... + 158196.

It is an arithmetic number, because the mean of its divisors is an integer number (52587535).

Almost surely, 2^669307028 is an apocalyptic number.

It is an amenable number.

669307028 is a deficient number, since it is larger than the sum of its proper divisors (592793812).

669307028 is a wasteful number, since it uses less digits than its factorization.

669307028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307 (or 7305 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 669307028 is about 25870.9688260799. The cubic root of 669307028 is about 874.7322295746.

The spelling of 669307028 in words is "six hundred sixty-nine million, three hundred seven thousand, twenty-eight".