781851340 has 24 divisors (see below), whose sum is σ = 1642586400. Its totient is φ = 312607488.

The previous prime is 781851319. The next prime is 781851347. The reversal of 781851340 is 43158187.

781851340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781851340² = 1222583035719591200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781851340.

It is not an unprimeable number, because it can be changed into a prime (781851347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49761 + ... + 63559.

It is an arithmetic number, because the mean of its divisors is an integer number (68441100).

Almost surely, 2^781851340 is an apocalyptic number.

It is an amenable number.

781851340 is an abundant number, since it is smaller than the sum of its proper divisors (860735060).

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

781851340 is a wasteful number, since it uses less digits than its factorization.

781851340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16641 (or 16639 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 781851340 is about 27961.6047465091. The cubic root of 781851340 is about 921.2441186437.

The spelling of 781851340 in words is "seven hundred eighty-one million, eight hundred fifty-one thousand, three hundred forty".