64442988 has 72 divisors (see below), whose sum is σ = 178476480. Its totient is φ = 19514880.

The previous prime is 64442981. The next prime is 64442999. The reversal of 64442988 is 88924446.

It is not an unprimeable number, because it can be changed into a prime (64442981) 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, 15933 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (2478840).

Almost surely, 2^64442988 is an apocalyptic number.

64442988 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64442988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89238240).

64442988 is an abundant number, since it is smaller than the sum of its proper divisors (114033492).

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

64442988 is a wasteful number, since it uses less digits than its factorization.

64442988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687 (or 3682 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 64442988 is about 8027.6390053365. The cubic root of 64442988 is about 400.9207704946.

The spelling of 64442988 in words is "sixty-four million, four hundred forty-two thousand, nine hundred eighty-eight".