2644642 has 32 divisors (see below), whose sum is σ = 5330304. Its totient is φ = 950400.

The previous prime is 2644637. The next prime is 2644657. The reversal of 2644642 is 2464462.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 6⁴ + 4² + 4⁶ + 6⁷ + 4⁹ + 2²¹ .

It is a self number, because there is not a number n which added to its sum of digits gives 2644642.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342 + ... + 2662.

It is an arithmetic number, because the mean of its divisors is an integer number (166572).

2^2644642 is an apocalyptic number.

2644642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2644642 is an abundant number, since it is smaller than the sum of its proper divisors (2685662).

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

2644642 is a wasteful number, since it uses less digits than its factorization.

2644642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354.

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

The square root of 2644642 is about 1626.2355302969. The cubic root of 2644642 is about 138.2894226851.

The spelling of 2644642 in words is "two million, six hundred forty-four thousand, six hundred forty-two".