64781868 has 24 divisors (see below), whose sum is σ = 159113920. Its totient is φ = 20457360.

The previous prime is 64781851. The next prime is 64781881. The reversal of 64781868 is 86818746.

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, 141838 + ... + 142293.

Almost surely, 2^64781868 is an apocalyptic number.

It is an amenable number.

64781868 is an abundant number, since it is smaller than the sum of its proper divisors (94332052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64781868 is a wasteful number, since it uses less digits than its factorization.

64781868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284157 (or 284155 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 64781868 is about 8048.7184072994. The cubic root of 64781868 is about 401.6223031031.

It can be divided in two parts, 6 and 4781868, that added together give a palindrome (4781874).

The spelling of 64781868 in words is "sixty-four million, seven hundred eighty-one thousand, eight hundred sixty-eight".