68744421 has 6 divisors (see below), whose sum is σ = 99297510. Its totient is φ = 45829608.

The previous prime is 68744399. The next prime is 68744437. The reversal of 68744421 is 12444786.

It can be written as a sum of positive squares in only one way, i.e., 50211396 + 18533025 = 7086^2 + 4305^2 .

It is not a de Polignac number, because 68744421 - 2¹⁰ = 68743397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68744461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3819126 + ... + 3819143.

It is an arithmetic number, because the mean of its divisors is an integer number (16549585).

Almost surely, 2^68744421 is an apocalyptic number.

It is an amenable number.

68744421 is a deficient number, since it is larger than the sum of its proper divisors (30553089).

68744421 is a wasteful number, since it uses less digits than its factorization.

68744421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638275 (or 7638272 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 68744421 is about 8291.2255427048. The cubic root of 68744421 is about 409.6495538045.

The spelling of 68744421 in words is "sixty-eight million, seven hundred forty-four thousand, four hundred twenty-one".