64535481 has 16 divisors (see below), whose sum is σ = 95760000. Its totient is φ = 42955344.

The previous prime is 64535479. The next prime is 64535483. The reversal of 64535481 is 18453546.

It is a happy number.

64535481 is a `hidden beast` number, since 64 + 53 + 548 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (64535479) and next prime (64535483).

It is not a de Polignac number, because 64535481 - 2¹ = 64535479 is a prime.

It is a super-2 number, since 2×64535481² = 8329656615802722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64535483) 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 in 15 ways as a sum of consecutive naturals, for example, 20020 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (5985000).

Almost surely, 2^64535481 is an apocalyptic number.

It is an amenable number.

64535481 is a deficient number, since it is larger than the sum of its proper divisors (31224519).

64535481 is a wasteful number, since it uses less digits than its factorization.

64535481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3799 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 64535481 is about 8033.3978489802. The cubic root of 64535481 is about 401.1124884717.

The spelling of 64535481 in words is "sixty-four million, five hundred thirty-five thousand, four hundred eighty-one".