2642645 has 6 divisors (see below), whose sum is σ = 3175542. Its totient is φ = 2111208.

The previous prime is 2642639. The next prime is 2642693. The reversal of 2642645 is 5462462.

It can be written as a sum of positive squares in only one way, i.e., 2114116 + 528529 = 1454^2 + 727^2 .

It is not a de Polignac number, because 2642645 - 2⁸ = 2642389 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 6³ + 4⁵ + 2²¹ + 6⁷ + 4⁹ + 5³ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3272 + ... + 3998.

It is an arithmetic number, because the mean of its divisors is an integer number (529257).

2^2642645 is an apocalyptic number.

It is an amenable number.

2642645 is a deficient number, since it is larger than the sum of its proper divisors (532897).

2642645 is an frugal number, since it uses more digits than its factorization.

2642645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459 (or 732 counting only the distinct ones).

The product of its digits is 11520, while the sum is 29.

The square root of 2642645 is about 1625.6214196423. The cubic root of 2642645 is about 138.2546059351.

Multiplying 2642645 by its product of digits (11520), we get a square (30443270400 = 174480²).

The spelling of 2642645 in words is "two million, six hundred forty-two thousand, six hundred forty-five".