669250872 has 96 divisors (see below), whose sum is σ = 1937688480. Its totient is φ = 208158720.

The previous prime is 669250861. The next prime is 669250877. The reversal of 669250872 is 278052966.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669250877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62968 + ... + 72824.

It is an arithmetic number, because the mean of its divisors is an integer number (20184255).

Almost surely, 2^669250872 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 669250872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968844240).

669250872 is an abundant number, since it is smaller than the sum of its proper divisors (1268437608).

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

669250872 is a wasteful number, since it uses less digits than its factorization.

669250872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9933 (or 9926 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 669250872 is about 25869.8834941327. The cubic root of 669250872 is about 874.7077650489.

The spelling of 669250872 in words is "six hundred sixty-nine million, two hundred fifty thousand, eight hundred seventy-two".