64678457 has 2 divisors, whose sum is σ = 64678458. Its totient is φ = 64678456.

The previous prime is 64678447. The next prime is 64678459. The reversal of 64678457 is 75487646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34527376 + 30151081 = 5876^2 + 5491^2 .

It is a cyclic number.

It is not a de Polignac number, because 64678457 - 2⁴ = 64678441 is a prime.

Together with 64678459, 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 (64678459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339228 + 32339229.

It is an arithmetic number, because the mean of its divisors is an integer number (32339229).

Almost surely, 2^64678457 is an apocalyptic number.

It is an amenable number.

64678457 is a deficient number, since it is larger than the sum of its proper divisors (1).

64678457 is an equidigital number, since it uses as much as digits as its factorization.

64678457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 47.

The square root of 64678457 is about 8042.2917753586. The cubic root of 64678457 is about 401.4084866753.

The spelling of 64678457 in words is "sixty-four million, six hundred seventy-eight thousand, four hundred fifty-seven".