7891221730 has 16 divisors (see below), whose sum is σ = 16233370560. Its totient is φ = 2705561712.

The previous prime is 7891221707. The next prime is 7891221749. The reversal of 7891221730 is 371221987.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 56365800 + ... + 56365939.

It is an arithmetic number, because the mean of its divisors is an integer number (1014585660).

Almost surely, 2^7891221730 is an apocalyptic number.

7891221730 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

7891221730 is an abundant number, since it is smaller than the sum of its proper divisors (8342148830).

7891221730 is a wasteful number, since it uses less digits than its factorization.

7891221730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112731753.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 7891221730 is about 88832.5488208010. The cubic root of 7891221730 is about 1990.8937451552.

The spelling of 7891221730 in words is "seven billion, eight hundred ninety-one million, two hundred twenty-one thousand, seven hundred thirty".