2644245 has 20 divisors (see below), whose sum is σ = 4740780. Its totient is φ = 1410048.

The previous prime is 2644219. The next prime is 2644247. The reversal of 2644245 is 5424462.

It can be written as a sum of positive squares in 2 ways, for example, as 544644 + 2099601 = 738^2 + 1449^2 .

It is not a de Polignac number, because 2644245 - 2⁶ = 2644181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁴ + 4⁵ + 4⁶ + 2²¹ + 4⁷ + 5 .

2644245 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644247) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2860 + ... + 3669.

It is an arithmetic number, because the mean of its divisors is an integer number (237039).

2^2644245 is an apocalyptic number.

It is an amenable number.

2644245 is a deficient number, since it is larger than the sum of its proper divisors (2096535).

2644245 is an equidigital number, since it uses as much as digits as its factorization.

2644245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6546 (or 6537 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 2644245 is about 1626.1134646758. The cubic root of 2644245 is about 138.2825025741.

The spelling of 2644245 in words is "two million, six hundred forty-four thousand, two hundred forty-five".