2687877921 has 8 divisors (see below), whose sum is σ = 3772460320. Its totient is φ = 1697607072.

The previous prime is 2687877853. The next prime is 2687877931. The reversal of 2687877921 is 1297787862.

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

It is not a de Polignac number, because 2687877921 - 2¹⁷ = 2687746849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 47155753 = 2687877921 / (2 + 6 + 8 + 7 + 8 + 7 + 7 + 9 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2687877931) 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, 23577820 + ... + 23577933.

It is an arithmetic number, because the mean of its divisors is an integer number (471557540).

Almost surely, 2^2687877921 is an apocalyptic number.

It is an amenable number.

2687877921 is a deficient number, since it is larger than the sum of its proper divisors (1084582399).

2687877921 is a wasteful number, since it uses less digits than its factorization.

2687877921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47155775.

The product of its digits is 4741632, while the sum is 57.

The square root of 2687877921 is about 51844.7482489789. The cubic root of 2687877921 is about 1390.3896085359.

The spelling of 2687877921 in words is "two billion, six hundred eighty-seven million, eight hundred seventy-seven thousand, nine hundred twenty-one".