64487687 has 4 divisors (see below), whose sum is σ = 70350216. Its totient is φ = 58625160.

The previous prime is 64487663. The next prime is 64487693. The reversal of 64487687 is 78678446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64487687 - 2¹² = 64483591 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 (64487287) 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, 2931248 + ... + 2931269.

It is an arithmetic number, because the mean of its divisors is an integer number (17587554).

Almost surely, 2^64487687 is an apocalyptic number.

64487687 is a deficient number, since it is larger than the sum of its proper divisors (5862529).

64487687 is a wasteful number, since it uses less digits than its factorization.

64487687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862528.

The product of its digits is 1806336, while the sum is 50.

The square root of 64487687 is about 8030.4225916199. The cubic root of 64487687 is about 401.0134447392.

The spelling of 64487687 in words is "sixty-four million, four hundred eighty-seven thousand, six hundred eighty-seven".