8726621 has 4 divisors (see below), whose sum is σ = 8736732. Its totient is φ = 8716512.

The previous prime is 8726611. The next prime is 8726633. The reversal of 8726621 is 1266278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 6446521 = 1510^2 + 2539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8726621 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 (8726611) 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, 3626 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (2184183).

Almost surely, 2^8726621 is an apocalyptic number.

It is an amenable number.

8726621 is a deficient number, since it is larger than the sum of its proper divisors (10111).

8726621 is an equidigital number, since it uses as much as digits as its factorization.

8726621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10110.

The product of its digits is 8064, while the sum is 32.

The square root of 8726621 is about 2954.0854760822. The cubic root of 8726621 is about 205.8805745713.

The spelling of 8726621 in words is "eight million, seven hundred twenty-six thousand, six hundred twenty-one".