64037281920 has 256 divisors, whose sum is σ = 211339169280. Its totient is φ = 16482631680.

The previous prime is 64037281831. The next prime is 64037281951. The reversal of 64037281920 is 2918273046.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6582660 + ... + 6592380.

It is an arithmetic number, because the mean of its divisors is an integer number (825543630).

Almost surely, 2^64037281920 is an apocalyptic number.

64037281920 is a gapful number since it is divisible by the number (60) 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 64037281920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105669584640).

64037281920 is an abundant number, since it is smaller than the sum of its proper divisors (147301887360).

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

64037281920 is a wasteful number, since it uses less digits than its factorization.

64037281920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9863 (or 9851 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 64037281920 in words is "sixty-four billion, thirty-seven million, two hundred eighty-one thousand, nine hundred twenty".