2780025 has 24 divisors (see below), whose sum is σ = 4654464. Its totient is φ = 1464000.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780025 is 5200872.

It is not a de Polignac number, because 2780025 - 2⁶ = 2779961 is a prime.

2780025 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2779977 and 2780004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7392 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (193936).

2^2780025 is an apocalyptic number.

2780025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2780025 is a deficient number, since it is larger than the sum of its proper divisors (1874439).

2780025 is a wasteful number, since it uses less digits than its factorization.

2780025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 2780025 is about 1667.3406970383. The cubic root of 2780025 is about 140.6100082784.

Adding to 2780025 its reverse (5200872), we get a palindrome (7980897).

The spelling of 2780025 in words is "two million, seven hundred eighty thousand, twenty-five".