116991864 has 96 divisors (see below), whose sum is σ = 358525440. Its totient is φ = 35445600.

The previous prime is 116991857. The next prime is 116991871. The reversal of 116991864 is 468199611.

It is an interprime number because it is at equal distance from previous prime (116991857) and next prime (116991871).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18649 + ... + 24119.

It is an arithmetic number, because the mean of its divisors is an integer number (3734640).

Almost surely, 2^116991864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 116991864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179262720).

116991864 is an abundant number, since it is smaller than the sum of its proper divisors (241533576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

116991864 is a wasteful number, since it uses less digits than its factorization.

116991864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503 (or 5487 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 116991864 is about 10816.2777331206. The cubic root of 116991864 is about 489.0859873629.

It can be divided in two parts, 116991 and 864, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 116991864 in words is "one hundred sixteen million, nine hundred ninety-one thousand, eight hundred sixty-four".