2778407125 has 16 divisors (see below), whose sum is σ = 3734181360. Its totient is φ = 2051745600.

The previous prime is 2778407123. The next prime is 2778407141. The reversal of 2778407125 is 5217048772.

It can be written as a sum of positive squares in 8 ways, for example, as 871076196 + 1907330929 = 29514^2 + 43673^2 .

It is not a de Polignac number, because 2778407125 - 2¹ = 2778407123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778407123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853270 + ... + 856519.

It is an arithmetic number, because the mean of its divisors is an integer number (233386335).

Almost surely, 2^2778407125 is an apocalyptic number.

2778407125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2778407125 is a deficient number, since it is larger than the sum of its proper divisors (955774235).

2778407125 is a wasteful number, since it uses less digits than its factorization.

2778407125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709817 (or 1709807 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 43.

The square root of 2778407125 is about 52710.5978433180. The cubic root of 2778407125 is about 1405.8272632207.

The spelling of 2778407125 in words is "two billion, seven hundred seventy-eight million, four hundred seven thousand, one hundred twenty-five".