669819964 has 48 divisors (see below), whose sum is σ = 1306368000. Its totient is φ = 297953600.

The previous prime is 669819929. The next prime is 669819967. The reversal of 669819964 is 469918966.

It is a super-2 number, since 2×669819964² = 897317568345922592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669819899 and 669819908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669819967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464757 + ... + 466195.

It is an arithmetic number, because the mean of its divisors is an integer number (27216000).

Almost surely, 2^669819964 is an apocalyptic number.

It is an amenable number.

669819964 is a deficient number, since it is larger than the sum of its proper divisors (636548036).

669819964 is a wasteful number, since it uses less digits than its factorization.

669819964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1672 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 58.

The square root of 669819964 is about 25880.8802786922. The cubic root of 669819964 is about 874.9556283350.

It can be divided in two parts, 6698 and 19964, that added together give a palindrome (26662).

The spelling of 669819964 in words is "six hundred sixty-nine million, eight hundred nineteen thousand, nine hundred sixty-four".