7943209920 has 420 divisors, whose sum is σ = 29978558280. Its totient is φ = 1990904832.

The previous prime is 7943209867. The next prime is 7943209921. The reversal of 7943209920 is 299023497.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7943209921) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 62544897 + ... + 62545023.

Almost surely, 2^7943209920 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 7943209920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14989279140).

7943209920 is an abundant number, since it is smaller than the sum of its proper divisors (22035348360).

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

7943209920 is a wasteful number, since it uses less digits than its factorization.

7943209920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 7943209920 is about 89124.6874889332. The cubic root of 7943209920 is about 1995.2562506502.

The spelling of 7943209920 in words is "seven billion, nine hundred forty-three million, two hundred nine thousand, nine hundred twenty".