2808121668 has 48 divisors (see below), whose sum is σ = 7166933760. Its totient is φ = 848685600.

The previous prime is 2808121661. The next prime is 2808121699. The reversal of 2808121668 is 8661218082.

It is a super-2 number, since 2×2808121668² = 15771094604582204448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2808121661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21963 + ... + 78093.

It is an arithmetic number, because the mean of its divisors is an integer number (149311120).

Almost surely, 2^2808121668 is an apocalyptic number.

It is an amenable number.

2808121668 is an abundant number, since it is smaller than the sum of its proper divisors (4358812092).

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

2808121668 is a wasteful number, since it uses less digits than its factorization.

2808121668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56528 (or 56526 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 2808121668 is about 52991.7132012167. The cubic root of 2808121668 is about 1410.8211885624.

The spelling of 2808121668 in words is "two billion, eight hundred eight million, one hundred twenty-one thousand, six hundred sixty-eight".