669479040 has 512 divisors, whose sum is σ = 2617401600. Its totient is φ = 161021952.

The previous prime is 669479039. The next prime is 669479071. The reversal of 669479040 is 40974966.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12631654 + ... + 12631706.

Almost surely, 2^669479040 is an apocalyptic number.

669479040 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 669479040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308700800).

669479040 is an abundant number, since it is smaller than the sum of its proper divisors (1947922560).

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

669479040 is a wasteful number, since it uses less digits than its factorization.

669479040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 669479040 is about 25874.2930338203. The cubic root of 669479040 is about 874.8071585912.

The spelling of 669479040 in words is "six hundred sixty-nine million, four hundred seventy-nine thousand, forty".