64638448 has 60 divisors (see below), whose sum is σ = 150760440. Its totient is φ = 26737536.

The previous prime is 64638439. The next prime is 64638449. The reversal of 64638448 is 84483646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21315 + ... + 24157.

It is an arithmetic number, because the mean of its divisors is an integer number (2512674).

Almost surely, 2^64638448 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 64638448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75380220).

64638448 is an abundant number, since it is smaller than the sum of its proper divisors (86121992).

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

64638448 is a wasteful number, since it uses less digits than its factorization.

64638448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894 (or 2881 counting only the distinct ones).

The product of its digits is 442368, while the sum is 43.

The square root of 64638448 is about 8039.8039777099. The cubic root of 64638448 is about 401.3257014353.

The spelling of 64638448 in words is "sixty-four million, six hundred thirty-eight thousand, four hundred forty-eight".