669409536 has 108 divisors (see below), whose sum is σ = 1842960336. Its totient is φ = 215700480.

The previous prime is 669409519. The next prime is 669409591. The reversal of 669409536 is 635904966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 737595 + ... + 738501.

Almost surely, 2^669409536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669409536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921480168).

669409536 is an abundant number, since it is smaller than the sum of its proper divisors (1173550800).

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

669409536 is an equidigital number, since it uses as much as digits as its factorization.

669409536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 669409536 is about 25872.9498897980. The cubic root of 669409536 is about 874.7768839561.

The spelling of 669409536 in words is "six hundred sixty-nine million, four hundred nine thousand, five hundred thirty-six".