781540378 has 16 divisors (see below), whose sum is σ = 1178034624. Its totient is φ = 388867680.

The previous prime is 781540339. The next prime is 781540379. The reversal of 781540378 is 873045187.

781540378 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 2×781540378² = 1221610724888765768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781540379) 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, 425923 + ... + 427753.

It is an arithmetic number, because the mean of its divisors is an integer number (73627164).

Almost surely, 2^781540378 is an apocalyptic number.

781540378 is a deficient number, since it is larger than the sum of its proper divisors (396494246).

781540378 is a wasteful number, since it uses less digits than its factorization.

781540378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 781540378 is about 27956.0436757421. The cubic root of 781540378 is about 921.1219684402.

The spelling of 781540378 in words is "seven hundred eighty-one million, five hundred forty thousand, three hundred seventy-eight".