669726288 has 540 divisors, whose sum is σ = 2632782880. Its totient is φ = 155105280.

The previous prime is 669726283. The next prime is 669726289. The reversal of 669726288 is 882627966.

669726288 is a `hidden beast` number, since 6 + 6 + 9 + 7 + 2 + 628 + 8 = 666.

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

Its product of digits (3483648) is a multiple of the sum of its prime factors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669726283) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 35248743 + ... + 35248761.

Almost surely, 2^669726288 is an apocalyptic number.

669726288 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669726288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316391440).

669726288 is an abundant number, since it is smaller than the sum of its proper divisors (1963056592).

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

669726288 is a wasteful number, since it uses less digits than its factorization.

669726288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 59 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 669726288 is about 25879.0704624413. The cubic root of 669726288 is about 874.9148381878.

The spelling of 669726288 in words is "six hundred sixty-nine million, seven hundred twenty-six thousand, two hundred eighty-eight".