64855487 has 4 divisors (see below), whose sum is σ = 66608376. Its totient is φ = 63102600.

The previous prime is 64855477. The next prime is 64855499. The reversal of 64855487 is 78455846.

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

It is a cyclic number.

It is not a de Polignac number, because 64855487 - 2¹⁰ = 64854463 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 (64855477) 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, 876389 + ... + 876462.

It is an arithmetic number, because the mean of its divisors is an integer number (16652094).

Almost surely, 2^64855487 is an apocalyptic number.

64855487 is a deficient number, since it is larger than the sum of its proper divisors (1752889).

64855487 is a wasteful number, since it uses less digits than its factorization.

64855487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752888.

The product of its digits is 1075200, while the sum is 47.

The square root of 64855487 is about 8053.2904455260. The cubic root of 64855487 is about 401.7743818672.

The spelling of 64855487 in words is "sixty-four million, eight hundred fifty-five thousand, four hundred eighty-seven".