669821952 has 176 divisors, whose sum is σ = 1881798912. Its totient is φ = 211599360.

The previous prime is 669821941. The next prime is 669821963. The reversal of 669821952 is 259128966.

It is an interprime number because it is at equal distance from previous prime (669821941) and next prime (669821963).

It is a super-2 number, since 2×669821952² = 897322894762180608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8070103 + ... + 8070185.

Almost surely, 2^669821952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669821952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940899456).

669821952 is an abundant number, since it is smaller than the sum of its proper divisors (1211976960).

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

669821952 is a wasteful number, since it uses less digits than its factorization.

669821952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 196 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 669821952 is about 25880.9186853945. The cubic root of 669821952 is about 874.9564939457.

The spelling of 669821952 in words is "six hundred sixty-nine million, eight hundred twenty-one thousand, nine hundred fifty-two".