2578789987 has 4 divisors (see below), whose sum is σ = 2602890936. Its totient is φ = 2554689040.

The previous prime is 2578789951. The next prime is 2578790003. The reversal of 2578789987 is 7899878752.

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 2578789987 - 2²⁷ = 2444572259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2578789487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12050314 + ... + 12050527.

It is an arithmetic number, because the mean of its divisors is an integer number (650722734).

Almost surely, 2^2578789987 is an apocalyptic number.

2578789987 is a deficient number, since it is larger than the sum of its proper divisors (24100949).

2578789987 is a wasteful number, since it uses less digits than its factorization.

2578789987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24100948.

The product of its digits is 142248960, while the sum is 70.

The square root of 2578789987 is about 50781.7879460737. The cubic root of 2578789987 is about 1371.3195213085.

The spelling of 2578789987 in words is "two billion, five hundred seventy-eight million, seven hundred eighty-nine thousand, nine hundred eighty-seven".