68821253 has 4 divisors (see below), whose sum is σ = 72869580. Its totient is φ = 64772928.

The previous prime is 68821241. The next prime is 68821273. The reversal of 68821253 is 35212886.

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 58721569 + 10099684 = 7663^2 + 3178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68821253 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 (68821273) 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, 2024138 + ... + 2024171.

It is an arithmetic number, because the mean of its divisors is an integer number (18217395).

Almost surely, 2^68821253 is an apocalyptic number.

It is an amenable number.

68821253 is a deficient number, since it is larger than the sum of its proper divisors (4048327).

68821253 is a wasteful number, since it uses less digits than its factorization.

68821253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048326.

The product of its digits is 23040, while the sum is 35.

The square root of 68821253 is about 8295.8575807447. The cubic root of 68821253 is about 409.8021115232.

The spelling of 68821253 in words is "sixty-eight million, eight hundred twenty-one thousand, two hundred fifty-three".