64407481 has 2 divisors, whose sum is σ = 64407482. Its totient is φ = 64407480.

The previous prime is 64407461. The next prime is 64407493. The reversal of 64407481 is 18470446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 21949225 = 6516^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 64407481 - 2⁵ = 64407449 is a prime.

It is a super-2 number, since 2×64407481² = 8296647217530722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64407461) 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, 32203740 + 32203741.

It is an arithmetic number, because the mean of its divisors is an integer number (32203741).

Almost surely, 2^64407481 is an apocalyptic number.

It is an amenable number.

64407481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64407481 is an equidigital number, since it uses as much as digits as its factorization.

64407481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 64407481 is about 8025.4271537408. The cubic root of 64407481 is about 400.8471234382.

The spelling of 64407481 in words is "sixty-four million, four hundred seven thousand, four hundred eighty-one".