7209126820 has 48 divisors (see below), whose sum is σ = 17898531840. Its totient is φ = 2386468224.

The previous prime is 7209126817. The next prime is 7209126853. The reversal of 7209126820 is 286219027.

It is a self number, because there is not a number n which added to its sum of digits gives 7209126820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883764 + ... + 891883.

It is an arithmetic number, because the mean of its divisors is an integer number (372886080).

Almost surely, 2^7209126820 is an apocalyptic number.

7209126820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7209126820 is an abundant number, since it is smaller than the sum of its proper divisors (10689405020).

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

7209126820 is a wasteful number, since it uses less digits than its factorization.

7209126820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775692 (or 1775690 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 7209126820 is about 84906.5770126202. The cubic root of 7209126820 is about 1931.7943365358.

The spelling of 7209126820 in words is "seven billion, two hundred nine million, one hundred twenty-six thousand, eight hundred twenty".