2778825 has 48 divisors (see below), whose sum is σ = 5396480. Its totient is φ = 1235520.

The previous prime is 2778823. The next prime is 2778827. The reversal of 2778825 is 5288772.

2778825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2778823) and next prime (2778827).

It is not a de Polignac number, because 2778825 - 2¹ = 2778823 is a prime.

2778825 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2778823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35136 + ... + 35214.

2^2778825 is an apocalyptic number.

2778825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2778825 is a deficient number, since it is larger than the sum of its proper divisors (2617655).

2778825 is a wasteful number, since it uses less digits than its factorization.

2778825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 161 counting only the distinct ones).

The product of its digits is 62720, while the sum is 39.

The square root of 2778825 is about 1666.9808037287. The cubic root of 2778825 is about 140.5897738928.

The spelling of 2778825 in words is "two million, seven hundred seventy-eight thousand, eight hundred twenty-five".