669767280 has 360 divisors, whose sum is σ = 2623104432. Its totient is φ = 140894208.

The previous prime is 669767261. The next prime is 669767311. The reversal of 669767280 is 82767966.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1987272 + ... + 1987608.

Almost surely, 2^669767280 is an apocalyptic number.

669767280 is a gapful number since it is divisible by the number (60) 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 669767280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1311552216).

669767280 is an abundant number, since it is smaller than the sum of its proper divisors (1953337152).

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

669767280 is a wasteful number, since it uses less digits than its factorization.

669767280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The square root of 669767280 is about 25879.8624416746. The cubic root of 669767280 is about 874.9326881553.

The spelling of 669767280 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, two hundred eighty".