669861404 has 24 divisors (see below), whose sum is σ = 1242013248. Its totient is φ = 315025920.

The previous prime is 669861371. The next prime is 669861419. The reversal of 669861404 is 404168966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182669 + ... + 186299.

It is an arithmetic number, because the mean of its divisors is an integer number (51750552).

Almost surely, 2^669861404 is an apocalyptic number.

It is an amenable number.

669861404 is a deficient number, since it is larger than the sum of its proper divisors (572151844).

669861404 is a wasteful number, since it uses less digits than its factorization.

669861404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365 (or 6363 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 669861404 is about 25881.6808573168. The cubic root of 669861404 is about 874.9736716976.

The spelling of 669861404 in words is "six hundred sixty-nine million, eight hundred sixty-one thousand, four hundred four".