7869311985 has 32 divisors (see below), whose sum is σ = 14033208960. Its totient is φ = 3742184448.

The previous prime is 7869311981. The next prime is 7869311993. The reversal of 7869311985 is 5891139687.

It is not a de Polignac number, because 7869311985 - 2² = 7869311981 is a prime.

It is a super-2 number, since 2×7869311985² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (7869311981) 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, 807262 + ... + 816951.

It is an arithmetic number, because the mean of its divisors is an integer number (438537780).

Almost surely, 2^7869311985 is an apocalyptic number.

It is an amenable number.

7869311985 is a deficient number, since it is larger than the sum of its proper divisors (6163896975).

7869311985 is a wasteful number, since it uses less digits than its factorization.

7869311985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624257.

The product of its digits is 3265920, while the sum is 57.

The square root of 7869311985 is about 88709.1426235199. The cubic root of 7869311985 is about 1989.0494846162.

The spelling of 7869311985 in words is "seven billion, eight hundred sixty-nine million, three hundred eleven thousand, nine hundred eighty-five".