68710421 has 4 divisors (see below), whose sum is σ = 73995852. Its totient is φ = 63424992.

The previous prime is 68710409. The next prime is 68710427. The reversal of 68710421 is 12401786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12401786 = 2 ⋅6200893.

It can be written as a sum of positive squares in 2 ways, for example, as 47458321 + 21252100 = 6889^2 + 4610^2 .

It is a cyclic number.

It is not a de Polignac number, because 68710421 - 2¹⁰ = 68709397 is a prime.

It is a super-2 number, since 2×68710421² = 9442243907994482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68710427) 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, 2642696 + ... + 2642721.

It is an arithmetic number, because the mean of its divisors is an integer number (18498963).

Almost surely, 2^68710421 is an apocalyptic number.

It is an amenable number.

68710421 is a deficient number, since it is larger than the sum of its proper divisors (5285431).

68710421 is a wasteful number, since it uses less digits than its factorization.

68710421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285430.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 68710421 is about 8289.1749287851. The cubic root of 68710421 is about 409.5820070787.

The spelling of 68710421 in words is "sixty-eight million, seven hundred ten thousand, four hundred twenty-one".