669265920 has 156 divisors (see below), whose sum is σ = 2320477536. Its totient is φ = 178421760.

The previous prime is 669265903. The next prime is 669265939. The reversal of 669265920 is 29562966.

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 11 ways as a sum of consecutive naturals, for example, 182505 + ... + 186135.

It is an arithmetic number, because the mean of its divisors is an integer number (14874856).

Almost surely, 2^669265920 is an apocalyptic number.

669265920 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 669265920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1160238768).

669265920 is an abundant number, since it is smaller than the sum of its proper divisors (1651211616).

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

669265920 is a wasteful number, since it uses less digits than its factorization.

669265920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666 (or 3641 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 669265920 is about 25870.1743326171. The cubic root of 669265920 is about 874.7143208883.

The spelling of 669265920 in words is "six hundred sixty-nine million, two hundred sixty-five thousand, nine hundred twenty".