64539687 has 16 divisors (see below), whose sum is σ = 88087680. Its totient is φ = 42018912.

The previous prime is 64539659. The next prime is 64539691. The reversal of 64539687 is 78693546.

It is not a de Polignac number, because 64539687 - 2¹¹ = 64537639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64539487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27733 + ... + 29969.

It is an arithmetic number, because the mean of its divisors is an integer number (5505480).

Almost surely, 2^64539687 is an apocalyptic number.

64539687 is a deficient number, since it is larger than the sum of its proper divisors (23547993).

64539687 is a wasteful number, since it uses less digits than its factorization.

64539687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462.

The product of its digits is 1088640, while the sum is 48.

The square root of 64539687 is about 8033.6596268450. The cubic root of 64539687 is about 401.1212022441.

The spelling of 64539687 in words is "sixty-four million, five hundred thirty-nine thousand, six hundred eighty-seven".