7921172064 has 96 divisors (see below), whose sum is σ = 22662630144. Its totient is φ = 2407887360.

The previous prime is 7921172057. The next prime is 7921172099. The reversal of 7921172064 is 4602711297.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 65349 + ... + 141819.

It is an arithmetic number, because the mean of its divisors is an integer number (236069064).

Almost surely, 2^7921172064 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 7921172064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11331315072).

7921172064 is an abundant number, since it is smaller than the sum of its proper divisors (14741458080).

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

7921172064 is a wasteful number, since it uses less digits than its factorization.

7921172064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76580 (or 76572 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 7921172064 is about 89000.9666464359. The cubic root of 7921172064 is about 1993.4093105967.

The spelling of 7921172064 in words is "seven billion, nine hundred twenty-one million, one hundred seventy-two thousand, sixty-four".