68403253 has 4 divisors (see below), whose sum is σ = 68757868. Its totient is φ = 68048640.

The previous prime is 68403229. The next prime is 68403259. The reversal of 68403253 is 35230486.

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 39652209 + 28751044 = 6297^2 + 5362^2 .

It is a cyclic number.

It is not a de Polignac number, because 68403253 - 2¹⁷ = 68272181 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 (68403259) 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, 177018 + ... + 177403.

It is an arithmetic number, because the mean of its divisors is an integer number (17189467).

Almost surely, 2^68403253 is an apocalyptic number.

It is an amenable number.

68403253 is a deficient number, since it is larger than the sum of its proper divisors (354615).

68403253 is a wasteful number, since it uses less digits than its factorization.

68403253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354614.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 68403253 is about 8270.6259134361. The cubic root of 68403253 is about 408.9707537029.

The spelling of 68403253 in words is "sixty-eight million, four hundred three thousand, two hundred fifty-three".