2780538 has 32 divisors (see below), whose sum is σ = 5806080. Its totient is φ = 887040.

The previous prime is 2780527. The next prime is 2780597. The reversal of 2780538 is 8350872.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2780499 and 2780508.

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 15 ways as a sum of consecutive naturals, for example, 21831 + ... + 21957.

It is an arithmetic number, because the mean of its divisors is an integer number (181440).

2^2780538 is an apocalyptic number.

2780538 is an abundant number, since it is smaller than the sum of its proper divisors (3025542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2780538 is a wasteful number, since it uses less digits than its factorization.

2780538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 2780538 is about 1667.4945277272. The cubic root of 2780538 is about 140.6186567015.

The spelling of 2780538 in words is "two million, seven hundred eighty thousand, five hundred thirty-eight".