64687128 has 64 divisors (see below), whose sum is σ = 179452800. Its totient is φ = 19265280.

The previous prime is 64687127. The next prime is 64687151. The reversal of 64687128 is 82178646.

It is a self number, because there is not a number n which added to its sum of digits gives 64687128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64687121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 17652.

It is an arithmetic number, because the mean of its divisors is an integer number (2803950).

Almost surely, 2^64687128 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 64687128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89726400).

64687128 is an abundant number, since it is smaller than the sum of its proper divisors (114765672).

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

64687128 is a wasteful number, since it uses less digits than its factorization.

64687128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232 (or 4228 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 64687128 is about 8042.8308449202. The cubic root of 64687128 is about 401.4264239073.

The spelling of 64687128 in words is "sixty-four million, six hundred eighty-seven thousand, one hundred twenty-eight".