64044238992 has 80 divisors (see below), whose sum is σ = 175546621440. Its totient is φ = 20050241536.

The previous prime is 64044238987. The next prime is 64044239011. The reversal of 64044238992 is 29983244046.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308938 + ... + 472790.

It is an arithmetic number, because the mean of its divisors is an integer number (2194332768).

Almost surely, 2^64044238992 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 64044238992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87773310720).

64044238992 is an abundant number, since it is smaller than the sum of its proper divisors (111502382448).

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

64044238992 is a wasteful number, since it uses less digits than its factorization.

64044238992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164360 (or 164354 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 64044238992 in words is "sixty-four billion, forty-four million, two hundred thirty-eight thousand, nine hundred ninety-two".