2644987 has 4 divisors (see below), whose sum is σ = 2649880. Its totient is φ = 2640096.

The previous prime is 2644981. The next prime is 2645011. The reversal of 2644987 is 7894462.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2644987 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518 + ... + 2755.

It is an arithmetic number, because the mean of its divisors is an integer number (662470).

2^2644987 is an apocalyptic number.

2644987 is a deficient number, since it is larger than the sum of its proper divisors (4893).

2644987 is an equidigital number, since it uses as much as digits as its factorization.

2644987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892.

The product of its digits is 96768, while the sum is 40.

The square root of 2644987 is about 1626.3416000336. The cubic root of 2644987 is about 138.2954358211.

The spelling of 2644987 in words is "two million, six hundred forty-four thousand, nine hundred eighty-seven".