2857781653878 has 16 divisors (see below), whose sum is σ = 5854967291376. Its totient is φ = 929359887360.

The previous prime is 2857781653877. The next prime is 2857781653933. The reversal of 2857781653878 is 8783561877582.

2857781653878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857781653877) 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, 5808499051 + ... + 5808499542.

It is an arithmetic number, because the mean of its divisors is an integer number (365935455711).

Almost surely, 2^{2857781653878} is an apocalyptic number.

2857781653878 is an abundant number, since it is smaller than the sum of its proper divisors (2997185637498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2857781653878 is a wasteful number, since it uses less digits than its factorization.

2857781653878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11616998639.

The product of its digits is 1264435200, while the sum is 75.

The spelling of 2857781653878 in words is "two trillion, eight hundred fifty-seven billion, seven hundred eighty-one million, six hundred fifty-three thousand, eight hundred seventy-eight".