2778676581 has 8 divisors (see below), whose sum is σ = 3731556640. Its totient is φ = 1839123792.

The previous prime is 2778676577. The next prime is 2778676609. The reversal of 2778676581 is 1856768772.

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

It is not a de Polignac number, because 2778676581 - 2² = 2778676577 is a prime.

It is a super-2 number, since 2×2778676581² = 15442087083595699122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778676081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3331330 + ... + 3332163.

It is an arithmetic number, because the mean of its divisors is an integer number (466444580).

Almost surely, 2^2778676581 is an apocalyptic number.

It is an amenable number.

2778676581 is a deficient number, since it is larger than the sum of its proper divisors (952880059).

2778676581 is a wasteful number, since it uses less digits than its factorization.

2778676581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6663635.

The product of its digits is 7902720, while the sum is 57.

The square root of 2778676581 is about 52713.1537758841. The cubic root of 2778676581 is about 1405.8727084859.

The spelling of 2778676581 in words is "two billion, seven hundred seventy-eight million, six hundred seventy-six thousand, five hundred eighty-one".