2780904857 has 8 divisors (see below), whose sum is σ = 2790606984. Its totient is φ = 2771215488.

The previous prime is 2780904839. The next prime is 2780904871. The reversal of 2780904857 is 7584090872.

2780904857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 41847961 + 2739056896 = 6469^2 + 52336^2 .

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 2780904857 - 2²⁶ = 2713795993 is a prime.

It is a super-3 number, since 3×2780904857³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780904887) 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, 651743 + ... + 655995.

It is an arithmetic number, because the mean of its divisors is an integer number (348825873).

Almost surely, 2^2780904857 is an apocalyptic number.

It is an amenable number.

2780904857 is a deficient number, since it is larger than the sum of its proper divisors (9702127).

2780904857 is a wasteful number, since it uses less digits than its factorization.

2780904857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 2780904857 is about 52734.2854033313. The cubic root of 2780904857 is about 1406.2484071699.

The spelling of 2780904857 in words is "two billion, seven hundred eighty million, nine hundred four thousand, eight hundred fifty-seven".