64867855 has 16 divisors (see below), whose sum is σ = 84651840. Its totient is φ = 47432448.

The previous prime is 64867853. The next prime is 64867861. The reversal of 64867855 is 55876846.

It is a cyclic number.

It is not a de Polignac number, because 64867855 - 2¹ = 64867853 is a prime.

It is a super-2 number, since 2×64867855² = 8415677224602050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64867799 and 64867808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64867853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1851 + ... + 11539.

It is an arithmetic number, because the mean of its divisors is an integer number (5290740).

Almost surely, 2^64867855 is an apocalyptic number.

64867855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64867855 is a deficient number, since it is larger than the sum of its proper divisors (19783985).

64867855 is a wasteful number, since it uses less digits than its factorization.

64867855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9810.

The product of its digits is 1612800, while the sum is 49.

The square root of 64867855 is about 8054.0582938044. The cubic root of 64867855 is about 401.7999198232.

It can be divided in two parts, 6486 and 7855, that added together give a palindrome (14341).

The spelling of 64867855 in words is "sixty-four million, eight hundred sixty-seven thousand, eight hundred fifty-five".