64944880 has 160 divisors (see below), whose sum is σ = 202987008. Its totient is φ = 18662400.

The previous prime is 64944863. The next prime is 64944881. The reversal of 64944880 is 8844946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64944881) 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, 79675 + ... + 80485.

Almost surely, 2^64944880 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 64944880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101493504).

64944880 is an abundant number, since it is smaller than the sum of its proper divisors (138042128).

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

64944880 is a wasteful number, since it uses less digits than its factorization.

64944880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 64944880 is about 8058.8386260056. The cubic root of 64944880 is about 401.9588912032.

The spelling of 64944880 in words is "sixty-four million, nine hundred forty-four thousand, eight hundred eighty".