669621036 has 24 divisors (see below), whose sum is σ = 1785656320. Its totient is φ = 191320272.

The previous prime is 669621019. The next prime is 669621037. The reversal of 669621036 is 630126966.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 669620985 and 669621003.

It is not an unprimeable number, because it can be changed into a prime (669621037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3985756 + ... + 3985923.

Almost surely, 2^669621036 is an apocalyptic number.

It is an amenable number.

669621036 is an abundant number, since it is smaller than the sum of its proper divisors (1116035284).

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

669621036 is a wasteful number, since it uses less digits than its factorization.

669621036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7971693 (or 7971691 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 669621036 is about 25877.0368473672. The cubic root of 669621036 is about 874.8690028655.

The spelling of 669621036 in words is "six hundred sixty-nine million, six hundred twenty-one thousand, thirty-six".