68628553 has 4 divisors (see below), whose sum is σ = 78432640. Its totient is φ = 58824468.

The previous prime is 68628517. The next prime is 68628563. The reversal of 68628553 is 35582686.

It is a happy number.

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 68628553 - 2¹³ = 68620361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68628563) 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, 4902033 + ... + 4902046.

It is an arithmetic number, because the mean of its divisors is an integer number (19608160).

Almost surely, 2^68628553 is an apocalyptic number.

It is an amenable number.

68628553 is a deficient number, since it is larger than the sum of its proper divisors (9804087).

68628553 is an equidigital number, since it uses as much as digits as its factorization.

68628553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9804086.

The product of its digits is 345600, while the sum is 43.

The square root of 68628553 is about 8284.2352091186. The cubic root of 68628553 is about 409.4192710353.

The spelling of 68628553 in words is "sixty-eight million, six hundred twenty-eight thousand, five hundred fifty-three".