1669632890 has 8 divisors (see below), whose sum is σ = 3005339220. Its totient is φ = 667853152.

The previous prime is 1669632869. The next prime is 1669632893. The reversal of 1669632890 is 982369661.

It can be written as a sum of positive squares in 2 ways, for example, as 1599760009 + 69872881 = 39997^2 + 8359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1669632893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83481635 + ... + 83481654.

Almost surely, 2^1669632890 is an apocalyptic number.

1669632890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1669632890 is a deficient number, since it is larger than the sum of its proper divisors (1335706330).

1669632890 is a wasteful number, since it uses less digits than its factorization.

1669632890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166963296.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1669632890 is about 40861.1415650615. The cubic root of 1669632890 is about 1186.3340539663.

The spelling of 1669632890 in words is "one billion, six hundred sixty-nine million, six hundred thirty-two thousand, eight hundred ninety".