64544238 has 48 divisors (see below), whose sum is σ = 153487152. Its totient is φ = 19440000.

The previous prime is 64544177. The next prime is 64544261. The reversal of 64544238 is 83244546.

64544238 is a `hidden beast` number, since 645 + 4 + 4 + 2 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34938 + ... + 36738.

It is an arithmetic number, because the mean of its divisors is an integer number (3197649).

Almost surely, 2^64544238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64544238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76743576).

64544238 is an abundant number, since it is smaller than the sum of its proper divisors (88942914).

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

64544238 is a wasteful number, since it uses less digits than its factorization.

64544238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001 (or 1998 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 64544238 is about 8033.9428676087. The cubic root of 64544238 is about 401.1306303432.

The spelling of 64544238 in words is "sixty-four million, five hundred forty-four thousand, two hundred thirty-eight".