781106781140 has 96 divisors (see below), whose sum is σ = 1980132532224. Its totient is φ = 253141822080.

The previous prime is 781106781113. The next prime is 781106781149. The reversal of 781106781140 is 41187601187.

It is a super-2 number, since 2×781106781140² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781106781091 and 781106781100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781106781149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1906154 + ... + 2279393.

It is an arithmetic number, because the mean of its divisors is an integer number (20626380544).

Almost surely, 2^781106781140 is an apocalyptic number.

781106781140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

781106781140 is an abundant number, since it is smaller than the sum of its proper divisors (1199025751084).

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

781106781140 is a wasteful number, since it uses less digits than its factorization.

781106781140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185637 (or 4185635 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 44.

The spelling of 781106781140 in words is "seven hundred eighty-one billion, one hundred six million, seven hundred eighty-one thousand, one hundred forty".