781705012 has 36 divisors (see below), whose sum is σ = 1514755620. Its totient is φ = 352696960.

The previous prime is 781704997. The next prime is 781705019. The reversal of 781705012 is 210507187.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 193933476 + 587771536 = 13926^2 + 24244^2 .

It is a super-2 number, since 2×781705012² = 1222125451571840288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781705019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60414 + ... + 72202.

It is an arithmetic number, because the mean of its divisors is an integer number (42076545).

Almost surely, 2^781705012 is an apocalyptic number.

It is an amenable number.

781705012 is a deficient number, since it is larger than the sum of its proper divisors (733050608).

781705012 is a wasteful number, since it uses less digits than its factorization.

781705012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952 (or 11939 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 781705012 is about 27958.9880360502. The cubic root of 781705012 is about 921.1866430031.

The spelling of 781705012 in words is "seven hundred eighty-one million, seven hundred five thousand, twelve".