669438720 has 108 divisors (see below), whose sum is σ = 2316228096. Its totient is φ = 178513920.

The previous prime is 669438709. The next prime is 669438739. The reversal of 669438720 is 27834966.

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, 17536 + ... + 40575.

Almost surely, 2^669438720 is an apocalyptic number.

669438720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669438720 is an abundant number, since it is smaller than the sum of its proper divisors (1646789376).

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

669438720 is a wasteful number, since it uses less digits than its factorization.

669438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58138 (or 58121 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 669438720 is about 25873.5138703656. The cubic root of 669438720 is about 874.7895962128.

The spelling of 669438720 in words is "six hundred sixty-nine million, four hundred thirty-eight thousand, seven hundred twenty".