64649947 has 2 divisors, whose sum is σ = 64649948. Its totient is φ = 64649946.

The previous prime is 64649939. The next prime is 64649969. The reversal of 64649947 is 74994646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64649947 - 2³ = 64649939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64649947.

It is not a weakly prime, because it can be changed into another prime (64649047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32324973 + 32324974.

It is an arithmetic number, because the mean of its divisors is an integer number (32324974).

Almost surely, 2^64649947 is an apocalyptic number.

64649947 is a deficient number, since it is larger than the sum of its proper divisors (1).

64649947 is an equidigital number, since it uses as much as digits as its factorization.

64649947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 64649947 is about 8040.5190752836. The cubic root of 64649947 is about 401.3494982660.

The spelling of 64649947 in words is "sixty-four million, six hundred forty-nine thousand, nine hundred forty-seven".