64687501 has 4 divisors (see below), whose sum is σ = 64958400. Its totient is φ = 64416604.

The previous prime is 64687489. The next prime is 64687517. The reversal of 64687501 is 10578646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64687501 - 2¹⁹ = 64163213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64687531) 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, 135091 + ... + 135568.

It is an arithmetic number, because the mean of its divisors is an integer number (16239600).

Almost surely, 2^64687501 is an apocalyptic number.

It is an amenable number.

64687501 is a deficient number, since it is larger than the sum of its proper divisors (270899).

64687501 is a wasteful number, since it uses less digits than its factorization.

64687501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270898.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 64687501 is about 8042.8540332397. The cubic root of 64687501 is about 401.4271954764.

The spelling of 64687501 in words is "sixty-four million, six hundred eighty-seven thousand, five hundred one".