669714240 has 224 divisors, whose sum is σ = 2316577536. Its totient is φ = 162938880.

The previous prime is 669714209. The next prime is 669714247. The reversal of 669714240 is 42417966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669714247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1285180 + ... + 1285700.

It is an arithmetic number, because the mean of its divisors is an integer number (10341864).

Almost surely, 2^669714240 is an apocalyptic number.

669714240 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 669714240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158288768).

669714240 is an abundant number, since it is smaller than the sum of its proper divisors (1646863296).

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

669714240 is a wasteful number, since it uses less digits than its factorization.

669714240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 669714240 is about 25878.8376864186. The cubic root of 669714240 is about 874.9095917474.

The spelling of 669714240 in words is "six hundred sixty-nine million, seven hundred fourteen thousand, two hundred forty".