669767760 has 120 divisors (see below), whose sum is σ = 2326938120. Its totient is φ = 172440576.

The previous prime is 669767737. The next prime is 669767771. The reversal of 669767760 is 67767966.

It can be written as a sum of positive squares in 4 ways, for example, as 273439296 + 396328464 = 16536^2 + 19908^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 669767697 and 669767706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4842 + ... + 36918.

It is an arithmetic number, because the mean of its divisors is an integer number (19391151).

Almost surely, 2^669767760 is an apocalyptic number.

669767760 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 669767760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163469060).

669767760 is an abundant number, since it is smaller than the sum of its proper divisors (1657170360).

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

669767760 is a wasteful number, since it uses less digits than its factorization.

669767760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32125 (or 32116 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 54.

The square root of 669767760 is about 25879.8717152926. The cubic root of 669767760 is about 874.9328971670.

The spelling of 669767760 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, seven hundred sixty".