1608920890 has 8 divisors (see below), whose sum is σ = 2896057620. Its totient is φ = 643568352.

The previous prime is 1608920879. The next prime is 1608920917. The reversal of 1608920890 is 980298061.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1576328209 + 32592681 = 39703^2 + 5709^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80446035 + ... + 80446054.

Almost surely, 2^1608920890 is an apocalyptic number.

1608920890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1608920890 is a deficient number, since it is larger than the sum of its proper divisors (1287136730).

1608920890 is a wasteful number, since it uses less digits than its factorization.

1608920890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160892096.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1608920890 is about 40111.3561226743. The cubic root of 1608920890 is about 1171.7768045389.

The spelling of 1608920890 in words is "one billion, six hundred eight million, nine hundred twenty thousand, eight hundred ninety".