2778273888 has 96 divisors (see below), whose sum is σ = 7864942176. Its totient is φ = 853659648.

The previous prime is 2778273851. The next prime is 2778273919. The reversal of 2778273888 is 8883728772.

It is a tau number, because it is divible by the number of its divisors (96).

Its product of digits (16859136) is a multiple of the sum of its prime factors (3136).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1393020 + ... + 1395012.

It is an arithmetic number, because the mean of its divisors is an integer number (81926481).

Almost surely, 2^2778273888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778273888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3932471088).

2778273888 is an abundant number, since it is smaller than the sum of its proper divisors (5086668288).

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

2778273888 is a wasteful number, since it uses less digits than its factorization.

2778273888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136 (or 3128 counting only the distinct ones).

The product of its digits is 16859136, while the sum is 60.

The square root of 2778273888 is about 52709.3339741644. Note that the first 3 decimals coincide. The cubic root of 2778273888 is about 1405.8047909680.

The spelling of 2778273888 in words is "two billion, seven hundred seventy-eight million, two hundred seventy-three thousand, eight hundred eighty-eight".