7920744280 has 32 divisors (see below), whose sum is σ = 18396570240. Its totient is φ = 3066094080.

The previous prime is 7920744269. The next prime is 7920744281. The reversal of 7920744280 is 824470297.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920744281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3192609 + ... + 3195088.

It is an arithmetic number, because the mean of its divisors is an integer number (574892820).

Almost surely, 2^7920744280 is an apocalyptic number.

It is an amenable number.

7920744280 is an abundant number, since it is smaller than the sum of its proper divisors (10475825960).

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

7920744280 is a wasteful number, since it uses less digits than its factorization.

7920744280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387739 (or 6387735 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 7920744280 is about 88998.5633591914. The cubic root of 7920744280 is about 1993.3734251682.

The spelling of 7920744280 in words is "seven billion, nine hundred twenty million, seven hundred forty-four thousand, two hundred eighty".