2678791 has 4 divisors (see below), whose sum is σ = 2819800. Its totient is φ = 2537784.

The previous prime is 2678789. The next prime is 2678807. The reversal of 2678791 is 1978762.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1978762 = 2 ⋅989381.

It is a cyclic number.

It is not a de Polignac number, because 2678791 - 2¹ = 2678789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70476 + ... + 70513.

It is an arithmetic number, because the mean of its divisors is an integer number (704950).

2^2678791 is an apocalyptic number.

2678791 is a deficient number, since it is larger than the sum of its proper divisors (141009).

2678791 is a wasteful number, since it uses less digits than its factorization.

2678791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141008.

The product of its digits is 42336, while the sum is 40.

The square root of 2678791 is about 1636.7012555748. The cubic root of 2678791 is about 138.8821007408.

The spelling of 2678791 in words is "two million, six hundred seventy-eight thousand, seven hundred ninety-one".