781138060 has 12 divisors (see below), whose sum is σ = 1640389968. Its totient is φ = 312455216.

The previous prime is 781138037. The next prime is 781138067. The reversal of 781138060 is 60831187.

781138060 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 2×781138060² = 1220353337561127200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781138067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19528432 + ... + 19528471.

It is an arithmetic number, because the mean of its divisors is an integer number (136699164).

Almost surely, 2^781138060 is an apocalyptic number.

It is an amenable number.

781138060 is an abundant number, since it is smaller than the sum of its proper divisors (859251908).

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

781138060 is a wasteful number, since it uses less digits than its factorization.

781138060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39056912 (or 39056910 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 781138060 is about 27948.8472034179. The cubic root of 781138060 is about 920.9638842405.

The spelling of 781138060 in words is "seven hundred eighty-one million, one hundred thirty-eight thousand, sixty".