64887818 has 4 divisors (see below), whose sum is σ = 97331730. Its totient is φ = 32443908.

The previous prime is 64887811. The next prime is 64887881. The reversal of 64887818 is 81878846.

64887818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 48622729 + 16265089 = 6973^2 + 4033^2 .

It is a super-2 number, since 2×64887818² = 8420857849602248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64887811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16221953 + ... + 16221956.

Almost surely, 2^64887818 is an apocalyptic number.

64887818 is a deficient number, since it is larger than the sum of its proper divisors (32443912).

64887818 is a wasteful number, since it uses less digits than its factorization.

64887818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32443911.

The product of its digits is 688128, while the sum is 50.

The square root of 64887818 is about 8055.2975115758. The cubic root of 64887818 is about 401.8411334007.

The spelling of 64887818 in words is "sixty-four million, eight hundred eighty-seven thousand, eight hundred eighteen".