64681287 has 32 divisors (see below), whose sum is σ = 96768000. Its totient is φ = 38099040.

The previous prime is 64681261. The next prime is 64681307. The reversal of 64681287 is 78218646.

It is not a de Polignac number, because 64681287 - 2⁸ = 64681031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64681247) 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 31 ways as a sum of consecutive naturals, for example, 270514 + ... + 270752.

It is an arithmetic number, because the mean of its divisors is an integer number (3024000).

Almost surely, 2^64681287 is an apocalyptic number.

64681287 is a deficient number, since it is larger than the sum of its proper divisors (32086713).

64681287 is a wasteful number, since it uses less digits than its factorization.

64681287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451.

The product of its digits is 129024, while the sum is 42.

The square root of 64681287 is about 8042.4677183064. The cubic root of 64681287 is about 401.4143411205.

The spelling of 64681287 in words is "sixty-four million, six hundred eighty-one thousand, two hundred eighty-seven".