7997221500 has 72 divisors (see below), whose sum is σ = 23297999088. Its totient is φ = 2131668800.

The previous prime is 7997221489. The next prime is 7997221517. The reversal of 7997221500 is 51227997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3462346 + ... + 3464654.

Almost surely, 2^7997221500 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 7997221500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11648999544).

7997221500 is an abundant number, since it is smaller than the sum of its proper divisors (15300777588).

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

7997221500 is an equidigital number, since it uses as much as digits as its factorization.

7997221500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640 (or 2319 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 7997221500 is about 89427.1854639293. The cubic root of 7997221500 is about 1999.7684315224.

The spelling of 7997221500 in words is "seven billion, nine hundred ninety-seven million, two hundred twenty-one thousand, five hundred".