669706488 has 128 divisors (see below), whose sum is σ = 2052864000. Its totient is φ = 200597760.

The previous prime is 669706469. The next prime is 669706493. The reversal of 669706488 is 884607966.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209881 + ... + 213047.

It is an arithmetic number, because the mean of its divisors is an integer number (16038000).

Almost surely, 2^669706488 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 669706488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026432000).

669706488 is an abundant number, since it is smaller than the sum of its proper divisors (1383157512).

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

669706488 is a wasteful number, since it uses less digits than its factorization.

669706488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282 (or 3272 counting only the distinct ones).

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

The square root of 669706488 is about 25878.6879110978. The cubic root of 669706488 is about 874.9062160165.

The spelling of 669706488 in words is "six hundred sixty-nine million, seven hundred six thousand, four hundred eighty-eight".