64756481 has 2 divisors, whose sum is σ = 64756482. Its totient is φ = 64756480.

The previous prime is 64756469. The next prime is 64756487. The reversal of 64756481 is 18465746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38950081 + 25806400 = 6241^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 64756481 - 2¹⁸ = 64494337 is a prime.

It is a super-2 number, since 2×64756481² = 8386803663006722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64756487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32378240 + 32378241.

It is an arithmetic number, because the mean of its divisors is an integer number (32378241).

Almost surely, 2^64756481 is an apocalyptic number.

It is an amenable number.

64756481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64756481 is an equidigital number, since it uses as much as digits as its factorization.

64756481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 64756481 is about 8047.1411693843. The cubic root of 64756481 is about 401.5698330838.

The spelling of 64756481 in words is "sixty-four million, seven hundred fifty-six thousand, four hundred eighty-one".