64634687 has 8 divisors (see below), whose sum is σ = 69669600. Its totient is φ = 59608800.

The previous prime is 64634683. The next prime is 64634723. The reversal of 64634687 is 78643646.

It is a happy number.

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 64634687 - 2² = 64634683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64634681) 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 7 ways as a sum of consecutive naturals, for example, 24062 + ... + 26612.

It is an arithmetic number, because the mean of its divisors is an integer number (8708700).

Almost surely, 2^64634687 is an apocalyptic number.

64634687 is a deficient number, since it is larger than the sum of its proper divisors (5034913).

64634687 is a wasteful number, since it uses less digits than its factorization.

64634687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513.

The product of its digits is 580608, while the sum is 44.

The square root of 64634687 is about 8039.5700755700. The cubic root of 64634687 is about 401.3179175477.

The spelling of 64634687 in words is "sixty-four million, six hundred thirty-four thousand, six hundred eighty-seven".