2878021779 has 8 divisors (see below), whose sum is σ = 3856646400. Its totient is φ = 1909039176.

The previous prime is 2878021723. The next prime is 2878021781. The reversal of 2878021779 is 9771208782.

It is a happy number.

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

It is not a de Polignac number, because 2878021779 - 2⁷ = 2878021651 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2878021079) 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, 2409807 + ... + 2411000.

It is an arithmetic number, because the mean of its divisors is an integer number (482080800).

Almost surely, 2^2878021779 is an apocalyptic number.

2878021779 is a deficient number, since it is larger than the sum of its proper divisors (978624621).

2878021779 is a wasteful number, since it uses less digits than its factorization.

2878021779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821009.

The product of its (nonzero) digits is 790272, while the sum is 51.

The square root of 2878021779 is about 53647.1973079675. The cubic root of 2878021779 is about 1422.4314915791.

It can be divided in two parts, 2878021 and 779, that added together give a triangular number (2878800 = T₂₃₉₉).

The spelling of 2878021779 in words is "two billion, eight hundred seventy-eight million, twenty-one thousand, seven hundred seventy-nine".