64648481 has 2 divisors, whose sum is σ = 64648482. Its totient is φ = 64648480.

The previous prime is 64648447. The next prime is 64648487. The reversal of 64648481 is 18484646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48720400 + 15928081 = 6980^2 + 3991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64648481 is a prime.

It is a super-2 number, since 2×64648481² = 8358852191214722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64648487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32324240 + 32324241.

It is an arithmetic number, because the mean of its divisors is an integer number (32324241).

Almost surely, 2^64648481 is an apocalyptic number.

It is an amenable number.

64648481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64648481 is an equidigital number, since it uses as much as digits as its factorization.

64648481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 41.

The square root of 64648481 is about 8040.4279114982. The cubic root of 64648481 is about 401.3464645806.

The spelling of 64648481 in words is "sixty-four million, six hundred forty-eight thousand, four hundred eighty-one".