68780121 has 4 divisors (see below), whose sum is σ = 91706832. Its totient is φ = 45853412.

The previous prime is 68780111. The next prime is 68780183. The reversal of 68780121 is 12108786.

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 68780121 - 2⁷ = 68779993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68780111) 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, 11463351 + ... + 11463356.

It is an arithmetic number, because the mean of its divisors is an integer number (22926708).

Almost surely, 2^68780121 is an apocalyptic number.

It is an amenable number.

68780121 is a deficient number, since it is larger than the sum of its proper divisors (22926711).

68780121 is a wasteful number, since it uses less digits than its factorization.

68780121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22926710.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 68780121 is about 8293.3781416260. The cubic root of 68780121 is about 409.7204539009.

It can be divided in two parts, 687 and 80121, that added together give a palindrome (80808).

The spelling of 68780121 in words is "sixty-eight million, seven hundred eighty thousand, one hundred twenty-one".