64249847 has 2 divisors, whose sum is σ = 64249848. Its totient is φ = 64249846.

The previous prime is 64249841. The next prime is 64249891. The reversal of 64249847 is 74894246.

It is an a-pointer prime, because the next prime (64249891) can be obtained adding 64249847 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64249847 - 2²⁴ = 47472631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64249798 and 64249807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64249841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32124923 + 32124924.

It is an arithmetic number, because the mean of its divisors is an integer number (32124924).

Almost surely, 2^64249847 is an apocalyptic number.

64249847 is a deficient number, since it is larger than the sum of its proper divisors (1).

64249847 is an equidigital number, since it uses as much as digits as its factorization.

64249847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The square root of 64249847 is about 8015.6002270572. The cubic root of 64249847 is about 400.5198387100.

The spelling of 64249847 in words is "sixty-four million, two hundred forty-nine thousand, eight hundred forty-seven".