669994416 has 600 divisors, whose sum is σ = 2635902720. Its totient is φ = 160123392.

The previous prime is 669994387. The next prime is 669994421. The reversal of 669994416 is 614499966.

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 an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 29130181 + ... + 29130203.

Almost surely, 2^669994416 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 669994416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317951360).

669994416 is an abundant number, since it is smaller than the sum of its proper divisors (1965908304).

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

669994416 is a wasteful number, since it uses less digits than its factorization.

669994416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 67 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 669994416 is about 25884.2503464945. The cubic root of 669994416 is about 875.0315813363.

The spelling of 669994416 in words is "six hundred sixty-nine million, nine hundred ninety-four thousand, four hundred sixteen".