64641384 has 48 divisors (see below), whose sum is σ = 179150400. Its totient is φ = 21045024.

The previous prime is 64641383. The next prime is 64641391. The reversal of 64641384 is 48314646.

64641384 is a `hidden beast` number, since 6 + 4 + 641 + 3 + 8 + 4 = 666.

It is a super-3 number, since 3×64641384³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (64641383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7344 + ... + 13535.

It is an arithmetic number, because the mean of its divisors is an integer number (3732300).

Almost surely, 2^64641384 is an apocalyptic number.

It is an amenable number.

64641384 is an abundant number, since it is smaller than the sum of its proper divisors (114509016).

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

64641384 is a wasteful number, since it uses less digits than its factorization.

64641384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20934 (or 20927 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 64641384 is about 8039.9865671530. The cubic root of 64641384 is about 401.3317776663.

It can be divided in two parts, 64641 and 384, that added together give a square (65025 = 255²).

The spelling of 64641384 in words is "sixty-four million, six hundred forty-one thousand, three hundred eighty-four".