7131438720 has 1024 divisors, whose sum is σ = 31726080000. Its totient is φ = 1477066752.

The previous prime is 7131438659. The next prime is 7131438731. The reversal of 7131438720 is 278341317.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 66648907 + ... + 66649013.

It is an arithmetic number, because the mean of its divisors is an integer number (30982500).

Almost surely, 2^7131438720 is an apocalyptic number.

7131438720 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 7131438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15863040000).

7131438720 is an abundant number, since it is smaller than the sum of its proper divisors (24594641280).

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

7131438720 is a wasteful number, since it uses less digits than its factorization.

7131438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 7131438720 is about 84447.8461537060. The cubic root of 7131438720 is about 1924.8300267080.

The spelling of 7131438720 in words is "seven billion, one hundred thirty-one million, four hundred thirty-eight thousand, seven hundred twenty".