64681523 has 8 divisors (see below), whose sum is σ = 66010560. Its totient is φ = 63360360.

The previous prime is 64681501. The next prime is 64681553. The reversal of 64681523 is 32518646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64681523 - 2⁶ = 64681459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64681553) 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 7 ways as a sum of consecutive naturals, for example, 16328 + ... + 19898.

It is an arithmetic number, because the mean of its divisors is an integer number (8251320).

Almost surely, 2^64681523 is an apocalyptic number.

64681523 is a deficient number, since it is larger than the sum of its proper divisors (1329037).

64681523 is a wasteful number, since it uses less digits than its factorization.

64681523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937.

The product of its digits is 34560, while the sum is 35.

The square root of 64681523 is about 8042.4823904066. The cubic root of 64681523 is about 401.4148293280.

The spelling of 64681523 in words is "sixty-four million, six hundred eighty-one thousand, five hundred twenty-three".