2587638 has 32 divisors (see below), whose sum is σ = 5723136. Its totient is φ = 775808.

The previous prime is 2587609. The next prime is 2587639. The reversal of 2587638 is 8367852.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2587596 and 2587605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2587639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1795 + ... + 2897.

It is an arithmetic number, because the mean of its divisors is an integer number (178848).

2^2587638 is an apocalyptic number.

2587638 is an abundant number, since it is smaller than the sum of its proper divisors (3135498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2587638 is a wasteful number, since it uses less digits than its factorization.

2587638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148.

The product of its digits is 80640, while the sum is 39.

The square root of 2587638 is about 1608.6136888638. The cubic root of 2587638 is about 137.2886096135.

The spelling of 2587638 in words is "two million, five hundred eighty-seven thousand, six hundred thirty-eight".