168953778 has 24 divisors (see below), whose sum is σ = 418362048. Its totient is φ = 48272472.

The previous prime is 168953753. The next prime is 168953821. The reversal of 168953778 is 877359861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670326 + ... + 670577.

It is an arithmetic number, because the mean of its divisors is an integer number (17431752).

Almost surely, 2^168953778 is an apocalyptic number.

168953778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168953778 is an abundant number, since it is smaller than the sum of its proper divisors (249408270).

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

168953778 is a wasteful number, since it uses less digits than its factorization.

168953778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340918 (or 1340915 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 168953778 is about 12998.2221091963. Note that the first 3 decimals coincide. The cubic root of 168953778 is about 552.8270722296.

The spelling of 168953778 in words is "one hundred sixty-eight million, nine hundred fifty-three thousand, seven hundred seventy-eight".