64774528 has 128 divisors (see below), whose sum is σ = 163134720. Its totient is φ = 24938496.

The previous prime is 64774513. The next prime is 64774529. The reversal of 64774528 is 82547746.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64774529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780375 + ... + 780457.

It is an arithmetic number, because the mean of its divisors is an integer number (1274490).

Almost surely, 2^64774528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64774528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81567360).

64774528 is an abundant number, since it is smaller than the sum of its proper divisors (98360192).

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

64774528 is a wasteful number, since it uses less digits than its factorization.

64774528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 172 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 64774528 is about 8048.2624211689. The cubic root of 64774528 is about 401.6071341516.

The spelling of 64774528 in words is "sixty-four million, seven hundred seventy-four thousand, five hundred twenty-eight".