669623976 has 128 divisors (see below), whose sum is σ = 2146176000. Its totient is φ = 189487296.

The previous prime is 669623971. The next prime is 669623989. The reversal of 669623976 is 679326966.

It is a happy number.

669623976 is a `hidden beast` number, since 6 + 6 + 9 + 623 + 9 + 7 + 6 = 666.

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 (669623971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159715 + ... + 163853.

It is an arithmetic number, because the mean of its divisors is an integer number (16767000).

Almost surely, 2^669623976 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 669623976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073088000).

669623976 is an abundant number, since it is smaller than the sum of its proper divisors (1476552024).

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

669623976 is a wasteful number, since it uses less digits than its factorization.

669623976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268 (or 4258 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 54.

The square root of 669623976 is about 25877.0936544273. The cubic root of 669623976 is about 874.8702832469.

The spelling of 669623976 in words is "six hundred sixty-nine million, six hundred twenty-three thousand, nine hundred seventy-six".