669552428 has 12 divisors (see below), whose sum is σ = 1180270392. Its totient is φ = 332332320.

The previous prime is 669552421. The next prime is 669552467. The reversal of 669552428 is 824255966.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (669552421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610358 + ... + 611453.

It is an arithmetic number, because the mean of its divisors is an integer number (98355866).

Almost surely, 2^669552428 is an apocalyptic number.

It is an amenable number.

669552428 is a deficient number, since it is larger than the sum of its proper divisors (510717964).

669552428 is a wasteful number, since it uses less digits than its factorization.

669552428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221952 (or 1221950 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 669552428 is about 25875.7111593092. The cubic root of 669552428 is about 874.8391227495.

The spelling of 669552428 in words is "six hundred sixty-nine million, five hundred fifty-two thousand, four hundred twenty-eight".