2578881247 has 4 divisors (see below), whose sum is σ = 2592243520. Its totient is φ = 2565518976.

The previous prime is 2578881203. The next prime is 2578881251. The reversal of 2578881247 is 7421888752.

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-2578881247 is a prime.

It is a super-2 number, since 2×2578881247² = 13301256972256550018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2578881194 and 2578881203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578881947) 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, 6680847 + ... + 6681232.

It is an arithmetic number, because the mean of its divisors is an integer number (648060880).

Almost surely, 2^2578881247 is an apocalyptic number.

2578881247 is a deficient number, since it is larger than the sum of its proper divisors (13362273).

2578881247 is a wasteful number, since it uses less digits than its factorization.

2578881247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13362272.

The product of its digits is 2007040, while the sum is 52.

The square root of 2578881247 is about 50782.6864886055. The cubic root of 2578881247 is about 1371.3356975182.

The spelling of 2578881247 in words is "two billion, five hundred seventy-eight million, eight hundred eighty-one thousand, two hundred forty-seven".