64531855 has 4 divisors (see below), whose sum is σ = 77438232. Its totient is φ = 51625480.

The previous prime is 64531843. The next prime is 64531871. The reversal of 64531855 is 55813546.

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

It is not a de Polignac number, because 64531855 - 2⁵ = 64531823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6453181 + ... + 6453190.

It is an arithmetic number, because the mean of its divisors is an integer number (19359558).

Almost surely, 2^64531855 is an apocalyptic number.

64531855 is a deficient number, since it is larger than the sum of its proper divisors (12906377).

64531855 is a wasteful number, since it uses less digits than its factorization.

64531855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906376.

The product of its digits is 72000, while the sum is 37.

The square root of 64531855 is about 8033.1721629752. The cubic root of 64531855 is about 401.1049760093.

The spelling of 64531855 in words is "sixty-four million, five hundred thirty-one thousand, eight hundred fifty-five".