669515728 has 40 divisors (see below), whose sum is σ = 1497806912. Its totient is φ = 283972608.

The previous prime is 669515677. The next prime is 669515741. The reversal of 669515728 is 827515966.

It is a super-3 number, since 3×669515728³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19950 + ... + 41677.

Almost surely, 2^669515728 is an apocalyptic number.

It is an amenable number.

669515728 is an abundant number, since it is smaller than the sum of its proper divisors (828291184).

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

669515728 is a wasteful number, since it uses less digits than its factorization.

669515728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61739 (or 61733 counting only the distinct ones).

The product of its digits is 907200, while the sum is 49.

The square root of 669515728 is about 25875.0019903381. The cubic root of 669515728 is about 874.8231383490.

The spelling of 669515728 in words is "six hundred sixty-nine million, five hundred fifteen thousand, seven hundred twenty-eight".