2647621 has 4 divisors (see below), whose sum is σ = 2657952. Its totient is φ = 2637292.

The previous prime is 2647607. The next prime is 2647627. The reversal of 2647621 is 1267462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2647621 - 2¹⁵ = 2614853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2647621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2647627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771 + ... + 5296.

It is an arithmetic number, because the mean of its divisors is an integer number (664488).

2^2647621 is an apocalyptic number.

It is an amenable number.

2647621 is a deficient number, since it is larger than the sum of its proper divisors (10331).

2647621 is a wasteful number, since it uses less digits than its factorization.

2647621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330.

The product of its digits is 4032, while the sum is 28.

The square root of 2647621 is about 1627.1511915000. The cubic root of 2647621 is about 138.3413275811.

The spelling of 2647621 in words is "two million, six hundred forty-seven thousand, six hundred twenty-one".