64681427 has 2 divisors, whose sum is σ = 64681428. Its totient is φ = 64681426.

The previous prime is 64681403. The next prime is 64681429. The reversal of 64681427 is 72418646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64681427 - 2¹⁸ = 64419283 is a prime.

Together with 64681429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64681429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32340713 + 32340714.

It is an arithmetic number, because the mean of its divisors is an integer number (32340714).

Almost surely, 2^64681427 is an apocalyptic number.

64681427 is a deficient number, since it is larger than the sum of its proper divisors (1).

64681427 is an equidigital number, since it uses as much as digits as its factorization.

64681427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 64681427 is about 8042.4764220979. The cubic root of 64681427 is about 401.4146307353.

The spelling of 64681427 in words is "sixty-four million, six hundred eighty-one thousand, four hundred twenty-seven".