2578784681 has 8 divisors (see below), whose sum is σ = 2852843328. Its totient is φ = 2311330000.

The previous prime is 2578784651. The next prime is 2578784707. The reversal of 2578784681 is 1864878752.

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

It is a cyclic number.

It is not a de Polignac number, because 2578784681 - 2⁶ = 2578784617 is a prime.

It is a super-2 number, since 2×2578784681² = 13300260861920543522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2578784651) 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, 1650170 + ... + 1651731.

It is an arithmetic number, because the mean of its divisors is an integer number (356605416).

Almost surely, 2^2578784681 is an apocalyptic number.

It is an amenable number.

2578784681 is a deficient number, since it is larger than the sum of its proper divisors (274058647).

2578784681 is a wasteful number, since it uses less digits than its factorization.

2578784681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301983.

The product of its digits is 6021120, while the sum is 56.

The square root of 2578784681 is about 50781.7357029080. The cubic root of 2578784681 is about 1371.3185807864.

The spelling of 2578784681 in words is "two billion, five hundred seventy-eight million, seven hundred eighty-four thousand, six hundred eighty-one".