781345212 has 24 divisors (see below), whose sum is σ = 1827106512. Its totient is φ = 259881600.

The previous prime is 781345199. The next prime is 781345219. The reversal of 781345212 is 212543187.

781345212 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 2×781345212² = 1221000680630649888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781345219) 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, 65089 + ... + 76152.

It is an arithmetic number, because the mean of its divisors is an integer number (76129438).

Almost surely, 2^781345212 is an apocalyptic number.

It is an amenable number.

781345212 is an abundant number, since it is smaller than the sum of its proper divisors (1045761300).

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

781345212 is a wasteful number, since it uses less digits than its factorization.

781345212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141709 (or 141707 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 781345212 is about 27952.5528708918. The cubic root of 781345212 is about 921.0452879677.

Adding to 781345212 its reverse (212543187), we get a palindrome (993888399).

The spelling of 781345212 in words is "seven hundred eighty-one million, three hundred forty-five thousand, two hundred twelve".