64807481 has 2 divisors, whose sum is σ = 64807482. Its totient is φ = 64807480.

The previous prime is 64807441. The next prime is 64807517. The reversal of 64807481 is 18470846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 18567481 = 6800^2 + 4309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64807481 is a prime.

It is a super-2 number, since 2×64807481² = 8400019187130722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64807441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32403740 + 32403741.

It is an arithmetic number, because the mean of its divisors is an integer number (32403741).

Almost surely, 2^64807481 is an apocalyptic number.

It is an amenable number.

64807481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64807481 is an equidigital number, since it uses as much as digits as its factorization.

64807481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 64807481 is about 8050.3093729372. The cubic root of 64807481 is about 401.6752263308.

The spelling of 64807481 in words is "sixty-four million, eight hundred seven thousand, four hundred eighty-one".