64481539 has 4 divisors (see below), whose sum is σ = 64867824. Its totient is φ = 64095256.

The previous prime is 64481507. The next prime is 64481563. The reversal of 64481539 is 93518446.

64481539 = T₆₅₅₅ + T₆₅₅₆ + T₆₅₅₇.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64481539 - 2⁵ = 64481507 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64481569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192892 + ... + 193225.

It is an arithmetic number, because the mean of its divisors is an integer number (16216956).

Almost surely, 2^64481539 is an apocalyptic number.

64481539 is the 6557-th centered triangular number.

64481539 is a deficient number, since it is larger than the sum of its proper divisors (386285).

64481539 is a wasteful number, since it uses less digits than its factorization.

64481539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386284.

The product of its digits is 103680, while the sum is 40.

The square root of 64481539 is about 8030.0397881953. The cubic root of 64481539 is about 401.0007006578. Note that the first 3 decimals are identical.

The spelling of 64481539 in words is "sixty-four million, four hundred eighty-one thousand, five hundred thirty-nine".