669393936 has 80 divisors (see below), whose sum is σ = 1973385600. Its totient is φ = 217095552.

The previous prime is 669393911. The next prime is 669393937. The reversal of 669393936 is 639393966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (669393937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4956 + ... + 36923.

It is an arithmetic number, because the mean of its divisors is an integer number (24667320).

Almost surely, 2^669393936 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 669393936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986692800).

669393936 is an abundant number, since it is smaller than the sum of its proper divisors (1303991664).

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

669393936 is a wasteful number, since it uses less digits than its factorization.

669393936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41933 (or 41921 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 54.

The square root of 669393936 is about 25872.6484148801. The cubic root of 669393936 is about 874.7700886015.

The spelling of 669393936 in words is "six hundred sixty-nine million, three hundred ninety-three thousand, nine hundred thirty-six".