7868780991 has 16 divisors (see below), whose sum is σ = 11670342400. Its totient is φ = 5240053944.

The previous prime is 7868780989. The next prime is 7868780993. The reversal of 7868780991 is 1990878687.

It is an interprime number because it is at equal distance from previous prime (7868780989) and next prime (7868780993).

It is not a de Polignac number, because 7868780991 - 2¹ = 7868780989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7868780993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136171 + ... + 185148.

It is an arithmetic number, because the mean of its divisors is an integer number (729396400).

Almost surely, 2^7868780991 is an apocalyptic number.

7868780991 is a deficient number, since it is larger than the sum of its proper divisors (3801561409).

7868780991 is a wasteful number, since it uses less digits than its factorization.

7868780991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322235 (or 322229 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The square root of 7868780991 is about 88706.1496797150. The cubic root of 7868780991 is about 1989.0047455463.

The spelling of 7868780991 in words is "seven billion, eight hundred sixty-eight million, seven hundred eighty thousand, nine hundred ninety-one".