64988947 has 2 divisors, whose sum is σ = 64988948. Its totient is φ = 64988946.

The previous prime is 64988939. The next prime is 64988951. The reversal of 64988947 is 74988946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64988947 - 2³ = 64988939 is a prime.

It is not a weakly prime, because it can be changed into another prime (64988047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32494473 + 32494474.

It is an arithmetic number, because the mean of its divisors is an integer number (32494474).

Almost surely, 2^64988947 is an apocalyptic number.

64988947 is a deficient number, since it is larger than the sum of its proper divisors (1).

64988947 is an equidigital number, since it uses as much as digits as its factorization.

64988947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 64988947 is about 8061.5722411946. The cubic root of 64988947 is about 402.0497842686.

Subtracting 64988947 from its reverse (74988946), we obtain a palindrome (9999999).

The spelling of 64988947 in words is "sixty-four million, nine hundred eighty-eight thousand, nine hundred forty-seven".