2581678247 has 8 divisors (see below), whose sum is σ = 2642467344. Its totient is φ = 2520923328.

The previous prime is 2581678207. The next prime is 2581678249. The reversal of 2581678247 is 7428761852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2581678247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2581678195 and 2581678204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581678249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207803 + ... + 219875.

It is an arithmetic number, because the mean of its divisors is an integer number (330308418).

Almost surely, 2^2581678247 is an apocalyptic number.

2581678247 is a deficient number, since it is larger than the sum of its proper divisors (60789097).

2581678247 is a wasteful number, since it uses less digits than its factorization.

2581678247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17089.

The product of its digits is 1505280, while the sum is 50.

The square root of 2581678247 is about 50810.2179389146. The cubic root of 2581678247 is about 1371.8312922787.

The spelling of 2581678247 in words is "two billion, five hundred eighty-one million, six hundred seventy-eight thousand, two hundred forty-seven".