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68621 = 79803
BaseRepresentation
bin10000110000001101
310111010112
4100300031
54143441
61245405
7404030
oct206015
9114115
1068621
1147613
1233865
1325307
141b017
15154eb
hex10c0d

68621 has 4 divisors (see below), whose sum is σ = 78432. Its totient is φ = 58812.

The previous prime is 68611. The next prime is 68633. The reversal of 68621 is 12686.

Adding to 68621 its sum of digits (23), we get a square (68644 = 2622).

It can be divided in two parts, 686 and 21, that added together give a palindrome (707).

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, and also an emirpimes, since its reverse is a distinct semiprime: 12686 = 26343.

It is a cyclic number.

It is not a de Polignac number, because 68621 - 214 = 52237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 68621.

It is not an unprimeable number, because it can be changed into a prime (68611) 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, 4895 + ... + 4908.

It is an arithmetic number, because the mean of its divisors is an integer number (19608).

268621 is an apocalyptic number.

It is an amenable number.

68621 is a deficient number, since it is larger than the sum of its proper divisors (9811).

68621 is an equidigital number, since it uses as much as digits as its factorization.

68621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9810.

The product of its digits is 576, while the sum is 23.

The square root of 68621 is about 261.9561031929. The cubic root of 68621 is about 40.9404250770.

The spelling of 68621 in words is "sixty-eight thousand, six hundred twenty-one".

Divisors: 1 7 9803 68621