2678721 has 8 divisors (see below), whose sum is σ = 3606720. Its totient is φ = 1768272.

The previous prime is 2678719. The next prime is 2678729. The reversal of 2678721 is 1278762.

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

It is not a de Polignac number, because 2678721 - 2¹ = 2678719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2678729) 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, 4026 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (450840).

2^2678721 is an apocalyptic number.

It is an amenable number.

2678721 is a deficient number, since it is larger than the sum of its proper divisors (927999).

2678721 is a wasteful number, since it uses less digits than its factorization.

2678721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8775.

The product of its digits is 9408, while the sum is 33.

The square root of 2678721 is about 1636.6798709583. The cubic root of 2678721 is about 138.8808910120.

The spelling of 2678721 in words is "two million, six hundred seventy-eight thousand, seven hundred twenty-one".