2642644 has 6 divisors (see below), whose sum is σ = 4624634. Its totient is φ = 1321320.

The previous prime is 2642639. The next prime is 2642693. The reversal of 2642644 is 4462462.

It can be written as a sum of positive squares in only one way, i.e., 2598544 + 44100 = 1612^2 + 210^2 .

It is a d-powerful number, because it can be written as 2¹¹ + 6⁴ + 4 + 2²¹ + 6⁷ + 4³ + 4⁹ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330327 + ... + 330334.

2^2642644 is an apocalyptic number.

It is an amenable number.

2642644 is a deficient number, since it is larger than the sum of its proper divisors (1981990).

2642644 is a wasteful number, since it uses less digits than its factorization.

2642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660665 (or 660663 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

The square root of 2642644 is about 1625.6211120676. The cubic root of 2642644 is about 138.2545884962.

The spelling of 2642644 in words is "two million, six hundred forty-two thousand, six hundred forty-four".