669544704 has 216 divisors, whose sum is σ = 2053484160. Its totient is φ = 217479168.

The previous prime is 669544703. The next prime is 669544709. The reversal of 669544704 is 407445966.

It is a tau number, because it is divible by the number of its divisors (216).

It is a super-2 number, since 2×669544704² = 896580221308895232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669544704.

It is not an unprimeable number, because it can be changed into a prime (669544703) 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, 2923662 + ... + 2923890.

Almost surely, 2^669544704 is an apocalyptic number.

669544704 is a gapful number since it is divisible by the number (64) 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 669544704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026742080).

669544704 is an abundant number, since it is smaller than the sum of its proper divisors (1383939456).

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

669544704 is an equidigital number, since it uses as much as digits as its factorization.

669544704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 669544704 is about 25875.5619069422. The cubic root of 669544704 is about 874.8357586697.

The spelling of 669544704 in words is "six hundred sixty-nine million, five hundred forty-four thousand, seven hundred four".