64871855 has 8 divisors (see below), whose sum is σ = 78441264. Its totient is φ = 51500800.

The previous prime is 64871827. The next prime is 64871861. The reversal of 64871855 is 55817846.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64871855 - 2¹⁰ = 64870831 is a prime.

It is a super-2 number, since 2×64871855² = 8416715142282050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 48866 + ... + 50175.

It is an arithmetic number, because the mean of its divisors is an integer number (9805158).

Almost surely, 2^64871855 is an apocalyptic number.

64871855 is a deficient number, since it is larger than the sum of its proper divisors (13569409).

64871855 is a wasteful number, since it uses less digits than its factorization.

64871855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99177.

The product of its digits is 268800, while the sum is 44.

The square root of 64871855 is about 8054.3066119934. The cubic root of 64871855 is about 401.8081784933.

The spelling of 64871855 in words is "sixty-four million, eight hundred seventy-one thousand, eight hundred fifty-five".