7999998720 has 864 divisors, whose sum is σ = 32765777856. Its totient is φ = 1651507200.

The previous prime is 7999998719. The next prime is 7999998749. The reversal of 7999998720 is 278999997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 131147490 + ... + 131147550.

It is an arithmetic number, because the mean of its divisors is an integer number (37923354).

Almost surely, 2^7999998720 is an apocalyptic number.

7999998720 is a gapful number since it is divisible by the number (70) 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 7999998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16382888928).

7999998720 is an abundant number, since it is smaller than the sum of its proper divisors (24765779136).

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

7999998720 is a wasteful number, since it uses less digits than its factorization.

7999998720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 46294416, while the sum is 69.

The square root of 7999998720 is about 89442.7119445738. The cubic root of 7999998720 is about 1999.9998933333. Note that the first 3 decimals are identical.

The spelling of 7999998720 in words is "seven billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, seven hundred twenty".