669839144 has 32 divisors (see below), whose sum is σ = 1354080000. Its totient is φ = 308809152.

The previous prime is 669839111. The next prime is 669839147. The reversal of 669839144 is 441938966.

It is a junction number, because it is equal to n+sod(n) for n = 669839092 and 669839101.

It is not an unprimeable number, because it can be changed into a prime (669839147) 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, 104957 + ... + 111155.

It is an arithmetic number, because the mean of its divisors is an integer number (42315000).

Almost surely, 2^669839144 is an apocalyptic number.

It is an amenable number.

669839144 is an abundant number, since it is smaller than the sum of its proper divisors (684240856).

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

669839144 is a wasteful number, since it uses less digits than its factorization.

669839144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7257 (or 7253 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 669839144 is about 25881.2508198503. The cubic root of 669839144 is about 874.9639795784.

The spelling of 669839144 in words is "six hundred sixty-nine million, eight hundred thirty-nine thousand, one hundred forty-four".