64373731520 has 224 divisors, whose sum is σ = 177594329088. Its totient is φ = 21769961472.

The previous prime is 64373731501. The next prime is 64373731531. The reversal of 64373731520 is 2513737346.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66570077 + ... + 66571043.

Almost surely, 2^64373731520 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 64373731520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88797164544).

64373731520 is an abundant number, since it is smaller than the sum of its proper divisors (113220597568).

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

64373731520 is a wasteful number, since it uses less digits than its factorization.

64373731520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 41.

The spelling of 64373731520 in words is "sixty-four billion, three hundred seventy-three million, seven hundred thirty-one thousand, five hundred twenty".