669356728 has 8 divisors (see below), whose sum is σ = 1255043880. Its totient is φ = 334678360.

The previous prime is 669356713. The next prime is 669356731. The reversal of 669356728 is 827653966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41834788 + ... + 41834803.

It is an arithmetic number, because the mean of its divisors is an integer number (156880485).

Almost surely, 2^669356728 is an apocalyptic number.

It is an amenable number.

669356728 is a deficient number, since it is larger than the sum of its proper divisors (585687152).

669356728 is a wasteful number, since it uses less digits than its factorization.

669356728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83669597 (or 83669593 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The square root of 669356728 is about 25871.9293443686. The cubic root of 669356728 is about 874.7538803835.

The spelling of 669356728 in words is "six hundred sixty-nine million, three hundred fifty-six thousand, seven hundred twenty-eight".