64664028 has 192 divisors, whose sum is σ = 203212800. Its totient is φ = 17521920.

The previous prime is 64664021. The next prime is 64664029. The reversal of 64664028 is 82046646.

It is a happy number.

64664028 is a `hidden beast` number, since 6 + 4 + 6 + 640 + 2 + 8 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 64663983 and 64664001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 818493 + ... + 818571.

It is an arithmetic number, because the mean of its divisors is an integer number (1058400).

Almost surely, 2^64664028 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 64664028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101606400).

64664028 is an abundant number, since it is smaller than the sum of its proper divisors (138548772).

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

64664028 is a wasteful number, since it uses less digits than its factorization.

64664028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 161 counting only the distinct ones).

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

The square root of 64664028 is about 8041.3946551578. The cubic root of 64664028 is about 401.3786346242.

The spelling of 64664028 in words is "sixty-four million, six hundred sixty-four thousand, twenty-eight".