64646784 has 96 divisors (see below), whose sum is σ = 197030340. Its totient is φ = 20275200.

The previous prime is 64646783. The next prime is 64646789. The reversal of 64646784 is 48764646.

64646784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64641600 + 5184 = 8040^2 + 72^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (64646783) 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 in 11 ways as a sum of consecutive naturals, for example, 17934 + ... + 21234.

Almost surely, 2^64646784 is an apocalyptic number.

64646784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64646784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98515170).

64646784 is an abundant number, since it is smaller than the sum of its proper divisors (132383556).

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

64646784 is a wasteful number, since it uses less digits than its factorization.

64646784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338 (or 3323 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 64646784 is about 8040.3223815964. The cubic root of 64646784 is about 401.3429528151.

The spelling of 64646784 in words is "sixty-four million, six hundred forty-six thousand, seven hundred eighty-four".