1669279320 has 256 divisors, whose sum is σ = 5830963200. Its totient is φ = 424258560.

The previous prime is 1669279319. The next prime is 1669279321. The reversal of 1669279320 is 239729661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1669279319) and next prime (1669279321).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669279321) 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, 2443699 + ... + 2444381.

It is an arithmetic number, because the mean of its divisors is an integer number (22777200).

Almost surely, 2^1669279320 is an apocalyptic number.

1669279320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669279320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2915481600).

1669279320 is an abundant number, since it is smaller than the sum of its proper divisors (4161683880).

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

1669279320 is a wasteful number, since it uses less digits than its factorization.

1669279320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 1669279320 is about 40856.8148538282. The cubic root of 1669279320 is about 1186.2503066655.

The spelling of 1669279320 in words is "one billion, six hundred sixty-nine million, two hundred seventy-nine thousand, three hundred twenty".