7721898240 has 216 divisors, whose sum is σ = 28688929920. Its totient is φ = 1764962304.

The previous prime is 7721898209. The next prime is 7721898263. The reversal of 7721898240 is 428981277.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 7721898240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167641 + ... + 208679.

It is an arithmetic number, because the mean of its divisors is an integer number (132819120).

Almost surely, 2^7721898240 is an apocalyptic number.

7721898240 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 7721898240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14344464960).

7721898240 is an abundant number, since it is smaller than the sum of its proper divisors (20967031680).

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

7721898240 is a wasteful number, since it uses less digits than its factorization.

7721898240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41077 (or 41056 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 7721898240 is about 87874.3320885001. The cubic root of 7721898240 is about 1976.5509999964.

The spelling of 7721898240 in words is "seven billion, seven hundred twenty-one million, eight hundred ninety-eight thousand, two hundred forty".