669853890 has 192 divisors, whose sum is σ = 1973237760. Its totient is φ = 156764160.

The previous prime is 669853843. The next prime is 669853901. The reversal of 669853890 is 98358966.

669853890 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1375227 + ... + 1375713.

It is an arithmetic number, because the mean of its divisors is an integer number (10277280).

Almost surely, 2^669853890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669853890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986618880).

669853890 is an abundant number, since it is smaller than the sum of its proper divisors (1303383870).

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

669853890 is a wasteful number, since it uses less digits than its factorization.

669853890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 669853890 is about 25881.5356963222. The cubic root of 669853890 is about 874.9704000871.

The spelling of 669853890 in words is "six hundred sixty-nine million, eight hundred fifty-three thousand, eight hundred ninety".