7871630749 has 4 divisors (see below), whose sum is σ = 8084377564. Its totient is φ = 7658883936.

The previous prime is 7871630729. The next prime is 7871630761. The reversal of 7871630749 is 9470361787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9470361787 = 241 ⋅39296107.

It can be written as a sum of positive squares in 2 ways, for example, as 4189325625 + 3682305124 = 64725^2 + 60682^2 .

It is a cyclic number.

It is not a de Polignac number, because 7871630749 - 2⁷ = 7871630621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7871630696 and 7871630705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7871630729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106373352 + ... + 106373425.

It is an arithmetic number, because the mean of its divisors is an integer number (2021094391).

Almost surely, 2^7871630749 is an apocalyptic number.

It is an amenable number.

7871630749 is a deficient number, since it is larger than the sum of its proper divisors (212746815).

7871630749 is a wasteful number, since it uses less digits than its factorization.

7871630749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212746814.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The square root of 7871630749 is about 88722.2111367836. The cubic root of 7871630749 is about 1989.2448292418.

The spelling of 7871630749 in words is "seven billion, eight hundred seventy-one million, six hundred thirty thousand, seven hundred forty-nine".