168888890 has 16 divisors (see below), whose sum is σ = 304148520. Its totient is φ = 67522560.

The previous prime is 168888883. The next prime is 168888893. The reversal of 168888890 is 98888861.

It can be written as a sum of positive squares in 4 ways, for example, as 165920161 + 2968729 = 12881^2 + 1723^2 .

It is not an unprimeable number, because it can be changed into a prime (168888893) 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, 35450 + ... + 39930.

Almost surely, 2^168888890 is an apocalyptic number.

168888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168888890 is a deficient number, since it is larger than the sum of its proper divisors (135259630).

168888890 is a wasteful number, since it uses less digits than its factorization.

168888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8257.

The product of its (nonzero) digits is 1769472, while the sum is 56.

The square root of 168888890 is about 12995.7258358277. The cubic root of 168888890 is about 552.7562906688.

The spelling of 168888890 in words is "one hundred sixty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".