64863687 has 32 divisors (see below), whose sum is σ = 108048384. Its totient is φ = 33753600.

The previous prime is 64863647. The next prime is 64863697. The reversal of 64863687 is 78636846.

It is a happy number.

It is not a de Polignac number, because 64863687 - 2⁷ = 64863559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64863607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8137 + ... + 13997.

It is an arithmetic number, because the mean of its divisors is an integer number (3376512).

Almost surely, 2^64863687 is an apocalyptic number.

64863687 is a deficient number, since it is larger than the sum of its proper divisors (43184697).

64863687 is a wasteful number, since it uses less digits than its factorization.

64863687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919.

The product of its digits is 1161216, while the sum is 48.

The square root of 64863687 is about 8053.7995381062. The cubic root of 64863687 is about 401.7913139277.

The spelling of 64863687 in words is "sixty-four million, eight hundred sixty-three thousand, six hundred eighty-seven".