2578987 has 2 divisors, whose sum is σ = 2578988. Its totient is φ = 2578986.

The previous prime is 2578973. The next prime is 2578991. The reversal of 2578987 is 7898752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2578987 is a prime.

It is not a weakly prime, because it can be changed into another prime (2578907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289493 + 1289494.

It is an arithmetic number, because the mean of its divisors is an integer number (1289494).

2^2578987 is an apocalyptic number.

2578987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578987 is an equidigital number, since it uses as much as digits as its factorization.

2578987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 46.

The square root of 2578987 is about 1605.9224763356. The cubic root of 2578987 is about 137.1354442194.

The spelling of 2578987 in words is "two million, five hundred seventy-eight thousand, nine hundred eighty-seven".