7871783649 has 32 divisors (see below), whose sum is σ = 11743211520. Its totient is φ = 4664554752.

The previous prime is 7871783641. The next prime is 7871783653. The reversal of 7871783649 is 9463871787.

It is not a de Polignac number, because 7871783649 - 2³ = 7871783641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7871783592 and 7871783601.

It is not an unprimeable number, because it can be changed into a prime (7871783641) 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 31 ways as a sum of consecutive naturals, for example, 50194 + ... + 135140.

It is an arithmetic number, because the mean of its divisors is an integer number (366975360).

Almost surely, 2^7871783649 is an apocalyptic number.

7871783649 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

7871783649 is a deficient number, since it is larger than the sum of its proper divisors (3871427871).

7871783649 is a wasteful number, since it uses less digits than its factorization.

7871783649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85069.

The product of its digits is 14224896, while the sum is 60.

The square root of 7871783649 is about 88723.0728108534. The cubic root of 7871783649 is about 1989.2577089773.

The spelling of 7871783649 in words is "seven billion, eight hundred seventy-one million, seven hundred eighty-three thousand, six hundred forty-nine".