2778253928 has 16 divisors (see below), whose sum is σ = 5350016580. Its totient is φ = 1351582848.

The previous prime is 2778253903. The next prime is 2778253939. The reversal of 2778253928 is 8293528772.

It can be written as a sum of positive squares in 2 ways, for example, as 2060978404 + 717275524 = 45398^2 + 26782^2 .

It is a super-3 number, since 3×2778253928³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2778253928.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4692701 + ... + 4693292.

Almost surely, 2^2778253928 is an apocalyptic number.

It is an amenable number.

2778253928 is a deficient number, since it is larger than the sum of its proper divisors (2571762652).

2778253928 is a wasteful number, since it uses less digits than its factorization.

2778253928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9386036 (or 9386032 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 53.

The square root of 2778253928 is about 52709.1446335453. The cubic root of 2778253928 is about 1405.8014243776.

The spelling of 2778253928 in words is "two billion, seven hundred seventy-eight million, two hundred fifty-three thousand, nine hundred twenty-eight".