2678611787 has 4 divisors (see below), whose sum is σ = 2680564080. Its totient is φ = 2676659496.

The previous prime is 2678611739. The next prime is 2678611843. The reversal of 2678611787 is 7871168762.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2678611787 - 2⁶ = 2678611723 is a prime.

It is a super-2 number, since 2×2678611787² = 14349922210910666738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2678614787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974087 + ... + 976832.

It is an arithmetic number, because the mean of its divisors is an integer number (670141020).

Almost surely, 2^2678611787 is an apocalyptic number.

2678611787 is a deficient number, since it is larger than the sum of its proper divisors (1952293).

2678611787 is a wasteful number, since it uses less digits than its factorization.

2678611787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952292.

The product of its digits is 1580544, while the sum is 53.

The square root of 2678611787 is about 51755.3068486701. The cubic root of 2678611787 is about 1388.7900356839.

The spelling of 2678611787 in words is "two billion, six hundred seventy-eight million, six hundred eleven thousand, seven hundred eighty-seven".