2564987 has 4 divisors (see below), whose sum is σ = 2587800. Its totient is φ = 2542176.

The previous prime is 2564957. The next prime is 2564999. The reversal of 2564987 is 7894652.

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 2564987 - 2¹² = 2560891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11237 + ... + 11462.

It is an arithmetic number, because the mean of its divisors is an integer number (646950).

2^2564987 is an apocalyptic number.

2564987 is a deficient number, since it is larger than the sum of its proper divisors (22813).

2564987 is a wasteful number, since it uses less digits than its factorization.

2564987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22812.

The product of its digits is 120960, while the sum is 41.

The square root of 2564987 is about 1601.5576792610. The cubic root of 2564987 is about 136.8868478030.

The spelling of 2564987 in words is "two million, five hundred sixty-four thousand, nine hundred eighty-seven".