64421879 has 2 divisors, whose sum is σ = 64421880. Its totient is φ = 64421878.

The previous prime is 64421809. The next prime is 64421881. The reversal of 64421879 is 97812446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64421879 - 2¹⁶ = 64356343 is a prime.

Together with 64421881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64421809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32210939 + 32210940.

It is an arithmetic number, because the mean of its divisors is an integer number (32210940).

Almost surely, 2^64421879 is an apocalyptic number.

64421879 is a deficient number, since it is larger than the sum of its proper divisors (1).

64421879 is an equidigital number, since it uses as much as digits as its factorization.

64421879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 64421879 is about 8026.3241275194. The cubic root of 64421879 is about 400.8769903977.

The spelling of 64421879 in words is "sixty-four million, four hundred twenty-one thousand, eight hundred seventy-nine".