669442368 has 112 divisors (see below), whose sum is σ = 2035251200. Its totient is φ = 190232064.

The previous prime is 669442363. The next prime is 669442373. The reversal of 669442368 is 863244966.

It is an interprime number because it is at equal distance from previous prime (669442363) and next prime (669442373).

It is a tau number, because it is divible by the number of its divisors (112).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669442363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266205 + ... + 268707.

Almost surely, 2^669442368 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 669442368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017625600).

669442368 is an abundant number, since it is smaller than the sum of its proper divisors (1365808832).

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

669442368 is a wasteful number, since it uses less digits than its factorization.

669442368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724 (or 2714 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

The square root of 669442368 is about 25873.5843670721. The cubic root of 669442368 is about 874.7911852189.

The spelling of 669442368 in words is "six hundred sixty-nine million, four hundred forty-two thousand, three hundred sixty-eight".