68275621 has 4 divisors (see below), whose sum is σ = 72291852. Its totient is φ = 64259392.

The previous prime is 68275601. The next prime is 68275633. The reversal of 68275621 is 12657286.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12657286 = 2 ⋅6328643.

It can be written as a sum of positive squares in 2 ways, for example, as 28206721 + 40068900 = 5311^2 + 6330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68275621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68275601) 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, 2008090 + ... + 2008123.

It is an arithmetic number, because the mean of its divisors is an integer number (18072963).

Almost surely, 2^68275621 is an apocalyptic number.

It is an amenable number.

68275621 is a deficient number, since it is larger than the sum of its proper divisors (4016231).

68275621 is a wasteful number, since it uses less digits than its factorization.

68275621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016230.

The product of its digits is 40320, while the sum is 37.

The square root of 68275621 is about 8262.9063288894. The cubic root of 68275621 is about 408.7162324070.

The spelling of 68275621 in words is "sixty-eight million, two hundred seventy-five thousand, six hundred twenty-one".