2168345478 has 64 divisors (see below), whose sum is σ = 4956360192. Its totient is φ = 626496000.

The previous prime is 2168345453. The next prime is 2168345483. The reversal of 2168345478 is 8745438612.

It is a super-2 number, since 2×2168345478² = 9403444223926096968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665353 + ... + 668603.

It is an arithmetic number, because the mean of its divisors is an integer number (77443128).

Almost surely, 2^2168345478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2168345478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478180096).

2168345478 is an abundant number, since it is smaller than the sum of its proper divisors (2788014714).

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

2168345478 is a wasteful number, since it uses less digits than its factorization.

2168345478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789.

The product of its digits is 1290240, while the sum is 48.

The square root of 2168345478 is about 46565.4966471958. The cubic root of 2168345478 is about 1294.3234696702.

It can be divided in two parts, 21683 and 45478, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 2168345478 in words is "two billion, one hundred sixty-eight million, three hundred forty-five thousand, four hundred seventy-eight".