68421725 has 6 divisors (see below), whose sum is σ = 84842970. Its totient is φ = 54737360.

The previous prime is 68421721. The next prime is 68421733. The reversal of 68421725 is 52712486.

It can be written as a sum of positive squares in 3 ways, for example, as 6280036 + 62141689 = 2506^2 + 7883^2 .

It is not a de Polignac number, because 68421725 - 2² = 68421721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68421721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1368410 + ... + 1368459.

It is an arithmetic number, because the mean of its divisors is an integer number (14140495).

Almost surely, 2^68421725 is an apocalyptic number.

It is an amenable number.

68421725 is a deficient number, since it is larger than the sum of its proper divisors (16421245).

68421725 is a wasteful number, since it uses less digits than its factorization.

68421725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736879 (or 2736874 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 68421725 is about 8271.7425612745. The cubic root of 68421725 is about 409.0075639788.

The spelling of 68421725 in words is "sixty-eight million, four hundred twenty-one thousand, seven hundred twenty-five".