2663621 has 8 divisors (see below), whose sum is σ = 2809080. Its totient is φ = 2521792.

The previous prime is 2663603. The next prime is 2663627. The reversal of 2663621 is 1263662.

It can be written as a sum of positive squares in 4 ways, for example, as 592900 + 2070721 = 770^2 + 1439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2663621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2663627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671 + ... + 2403.

It is an arithmetic number, because the mean of its divisors is an integer number (351135).

2^2663621 is an apocalyptic number.

It is an amenable number.

2663621 is a deficient number, since it is larger than the sum of its proper divisors (145459).

2663621 is a wasteful number, since it uses less digits than its factorization.

2663621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815.

The product of its digits is 2592, while the sum is 26.

The square root of 2663621 is about 1632.0603542762. The cubic root of 2663621 is about 138.6194410753.

The spelling of 2663621 in words is "two million, six hundred sixty-three thousand, six hundred twenty-one".