64318644 has 96 divisors (see below), whose sum is σ = 182766080. Its totient is φ = 19440000.

The previous prime is 64318643. The next prime is 64318651. The reversal of 64318644 is 44681346.

64318644 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 8 + 644 = 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 = 64318599 and 64318608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64318643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85269 + ... + 86019.

Almost surely, 2^64318644 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 64318644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91383040).

64318644 is an abundant number, since it is smaller than the sum of its proper divisors (118447436).

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

64318644 is a wasteful number, since it uses less digits than its factorization.

64318644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838 (or 830 counting only the distinct ones).

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

The square root of 64318644 is about 8019.8905229436. The cubic root of 64318644 is about 400.6627429895.

The spelling of 64318644 in words is "sixty-four million, three hundred eighteen thousand, six hundred forty-four".