2564390 has 16 divisors (see below), whose sum is σ = 4663440. Its totient is φ = 1015200.

The previous prime is 2564381. The next prime is 2564407. The reversal of 2564390 is 934652.

It is a congruent number.

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, 260 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (291465).

2^2564390 is an apocalyptic number.

2564390 is a deficient number, since it is larger than the sum of its proper divisors (2099050).

2564390 is a wasteful number, since it uses less digits than its factorization.

2564390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 2564390 is about 1601.3712873659. The cubic root of 2564390 is about 136.8762268539.

The spelling of 2564390 in words is "two million, five hundred sixty-four thousand, three hundred ninety".