669390048 has 48 divisors (see below), whose sum is σ = 1952390160. Its totient is φ = 223129728.

The previous prime is 669390047. The next prime is 669390107. The reversal of 669390048 is 840093966.

669390048 is nontrivially palindromic in base 15.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×669390048² = 896166072722884608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669389985 and 669390012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669390047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386515 + ... + 388242.

It is an arithmetic number, because the mean of its divisors is an integer number (40674795).

Almost surely, 2^669390048 is an apocalyptic number.

It is an amenable number.

669390048 is an abundant number, since it is smaller than the sum of its proper divisors (1283000112).

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

669390048 is a wasteful number, since it uses less digits than its factorization.

669390048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774776 (or 774762 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 669390048 is about 25872.5732775076. The cubic root of 669390048 is about 874.7683949736.

The spelling of 669390048 in words is "six hundred sixty-nine million, three hundred ninety thousand, forty-eight".