669134620 has 192 divisors, whose sum is σ = 1889879040. Its totient is φ = 192614400.

The previous prime is 669134617. The next prime is 669134623. The reversal of 669134620 is 26431966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (669134617) and next prime (669134623).

It is a super-2 number, since 2×669134620² = 895482279365088800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669134620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669134623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1596771 + ... + 1597189.

It is an arithmetic number, because the mean of its divisors is an integer number (9843120).

Almost surely, 2^669134620 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 669134620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944939520).

669134620 is an abundant number, since it is smaller than the sum of its proper divisors (1220744420).

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

669134620 is a wasteful number, since it uses less digits than its factorization.

669134620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 669134620 is about 25867.6365368002. The cubic root of 669134620 is about 874.6571151756.

The spelling of 669134620 in words is "six hundred sixty-nine million, one hundred thirty-four thousand, six hundred twenty".