7851280140 has 144 divisors (see below), whose sum is σ = 26042155776. Its totient is φ = 1898832000.

The previous prime is 7851280139. The next prime is 7851280141. The reversal of 7851280140 is 410821587.

It is an interprime number because it is at equal distance from previous prime (7851280139) and next prime (7851280141).

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

It is a junction number, because it is equal to n+sod(n) for n = 7851280095 and 7851280104.

It is not an unprimeable number, because it can be changed into a prime (7851280141) 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 47 ways as a sum of consecutive naturals, for example, 872665 + ... + 881615.

It is an arithmetic number, because the mean of its divisors is an integer number (180848304).

Almost surely, 2^7851280140 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 7851280140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13021077888).

7851280140 is an abundant number, since it is smaller than the sum of its proper divisors (18190875636).

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

7851280140 is a wasteful number, since it uses less digits than its factorization.

7851280140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420 (or 9415 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 7851280140 is about 88607.4496868068. The cubic root of 7851280140 is about 1987.5290780129.

The spelling of 7851280140 in words is "seven billion, eight hundred fifty-one million, two hundred eighty thousand, one hundred forty".