2778625 has 8 divisors (see below), whose sum is σ = 3467880. Its totient is φ = 2222800.

The previous prime is 2778619. The next prime is 2778647. The reversal of 2778625 is 5268772.

It can be written as a sum of positive squares in 4 ways, for example, as 294849 + 2483776 = 543^2 + 1576^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2778625 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10990 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (433485).

2^2778625 is an apocalyptic number.

2778625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2778625 is a deficient number, since it is larger than the sum of its proper divisors (689255).

2778625 is an equidigital number, since it uses as much as digits as its factorization.

2778625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22244 (or 22234 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 2778625 is about 1666.9208139561. The cubic root of 2778625 is about 140.5864009288.

It can be divided in two parts, 2778 and 625, that added together give a triangular number (3403 = T₈₂).

The spelling of 2778625 in words is "two million, seven hundred seventy-eight thousand, six hundred twenty-five".