7981875135 has 64 divisors (see below), whose sum is σ = 15694680960. Its totient is φ = 3823303680.

The previous prime is 7981875131. The next prime is 7981875179. The reversal of 7981875135 is 5315781897.

It is a happy number.

It is not a de Polignac number, because 7981875135 - 2² = 7981875131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981875131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3475 + ... + 126395.

It is an arithmetic number, because the mean of its divisors is an integer number (245229390).

Almost surely, 2^7981875135 is an apocalyptic number.

7981875135 is a deficient number, since it is larger than the sum of its proper divisors (7712805825).

7981875135 is a wasteful number, since it uses less digits than its factorization.

7981875135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122985 (or 122979 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 54.

The square root of 7981875135 is about 89341.3405708690. The cubic root of 7981875135 is about 1998.4884524832.

It can be divided in two parts, 7981875 and 135, that added together give a triangular number (7982010 = T₃₉₉₅).

The spelling of 7981875135 in words is "seven billion, nine hundred eighty-one million, eight hundred seventy-five thousand, one hundred thirty-five".