2688921845 has 8 divisors (see below), whose sum is σ = 3262961880. Its totient is φ = 2126967040.

The previous prime is 2688921817. The next prime is 2688921853. The reversal of 2688921845 is 5481298862.

It can be written as a sum of positive squares in 4 ways, for example, as 4231249 + 2684690596 = 2057^2 + 51814^2 .

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

It is not a de Polignac number, because 2688921845 - 2²⁰ = 2687873269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3020816 + ... + 3021705.

It is an arithmetic number, because the mean of its divisors is an integer number (407870235).

Almost surely, 2^2688921845 is an apocalyptic number.

It is an amenable number.

2688921845 is a deficient number, since it is larger than the sum of its proper divisors (574040035).

2688921845 is an equidigital number, since it uses as much as digits as its factorization.

2688921845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042615.

The product of its digits is 2211840, while the sum is 53.

The square root of 2688921845 is about 51854.8150608986. The cubic root of 2688921845 is about 1390.5695861065.

The spelling of 2688921845 in words is "two billion, six hundred eighty-eight million, nine hundred twenty-one thousand, eight hundred forty-five".