68800421 has 4 divisors (see below), whose sum is σ = 68881932. Its totient is φ = 68718912.

The previous prime is 68800399. The next prime is 68800423. The reversal of 68800421 is 12400886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12400886 = 2 ⋅6200443.

It can be written as a sum of positive squares in 2 ways, for example, as 42432196 + 26368225 = 6514^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 68800421 - 2²² = 64606117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68800423) 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, 39476 + ... + 41181.

It is an arithmetic number, because the mean of its divisors is an integer number (17220483).

Almost surely, 2^68800421 is an apocalyptic number.

It is an amenable number.

68800421 is a deficient number, since it is larger than the sum of its proper divisors (81511).

68800421 is an equidigital number, since it uses as much as digits as its factorization.

68800421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81510.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 68800421 is about 8294.6019193208. The cubic root of 68800421 is about 409.7607587010.

The spelling of 68800421 in words is "sixty-eight million, eight hundred thousand, four hundred twenty-one".