781808112 has 100 divisors (see below), whose sum is σ = 2315567320. Its totient is φ = 254524032.

The previous prime is 781808107. The next prime is 781808149. The reversal of 781808112 is 211808187.

It is a super-2 number, since 2×781808112² = 1222447847978009088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48714 + ... + 62742.

Almost surely, 2^781808112 is an apocalyptic number.

781808112 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781808112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157783660).

781808112 is an abundant number, since it is smaller than the sum of its proper divisors (1533759208).

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

781808112 is a wasteful number, since it uses less digits than its factorization.

781808112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14092 (or 14077 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 781808112 is about 27960.8317472853. The cubic root of 781808112 is about 921.2271400219.

The spelling of 781808112 in words is "seven hundred eighty-one million, eight hundred eight thousand, one hundred twelve".