68649251 has 4 divisors (see below), whose sum is σ = 74890104. Its totient is φ = 62408400.

The previous prime is 68649241. The next prime is 68649277. The reversal of 68649251 is 15294686.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68649251 - 2¹⁴ = 68632867 is a prime.

It is a super-2 number, since 2×68649251² = 9425439325722002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68649199 and 68649208.

It is not an unprimeable number, because it can be changed into a prime (68649241) 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, 3120410 + ... + 3120431.

It is an arithmetic number, because the mean of its divisors is an integer number (18722526).

Almost surely, 2^68649251 is an apocalyptic number.

68649251 is a deficient number, since it is larger than the sum of its proper divisors (6240853).

68649251 is a wasteful number, since it uses less digits than its factorization.

68649251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240852.

The product of its digits is 103680, while the sum is 41.

The square root of 68649251 is about 8285.4843551841. The cubic root of 68649251 is about 409.4604264433.

The spelling of 68649251 in words is "sixty-eight million, six hundred forty-nine thousand, two hundred fifty-one".