64989144 has 96 divisors (see below), whose sum is σ = 198282240. Its totient is φ = 19051200.

The previous prime is 64989143. The next prime is 64989151. The reversal of 64989144 is 44198946.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 64989144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64989143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23229 + ... + 25875.

It is an arithmetic number, because the mean of its divisors is an integer number (2065440).

Almost surely, 2^64989144 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 64989144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99141120).

64989144 is an abundant number, since it is smaller than the sum of its proper divisors (133293096).

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

64989144 is a wasteful number, since it uses less digits than its factorization.

64989144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701 (or 2694 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 64989144 is about 8061.5844596456. The cubic root of 64989144 is about 402.0501905107.

The spelling of 64989144 in words is "sixty-four million, nine hundred eighty-nine thousand, one hundred forty-four".