64428647 has 2 divisors, whose sum is σ = 64428648. Its totient is φ = 64428646.

The previous prime is 64428641. The next prime is 64428673. The reversal of 64428647 is 74682446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64428647 - 2⁴ = 64428631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64428641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32214323 + 32214324.

It is an arithmetic number, because the mean of its divisors is an integer number (32214324).

Almost surely, 2^64428647 is an apocalyptic number.

64428647 is a deficient number, since it is larger than the sum of its proper divisors (1).

64428647 is an equidigital number, since it uses as much as digits as its factorization.

64428647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 41.

The square root of 64428647 is about 8026.7457291234. The cubic root of 64428647 is about 400.8910282811.

The spelling of 64428647 in words is "sixty-four million, four hundred twenty-eight thousand, six hundred forty-seven".