781312012 has 36 divisors (see below), whose sum is σ = 1484474040. Its totient is φ = 359653632.

The previous prime is 781311983. The next prime is 781312033. The reversal of 781312012 is 210213187.

It is a happy number.

It is a super-2 number, since 2×781312012² = 1220896920190976288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298164 + ... + 300772.

It is an arithmetic number, because the mean of its divisors is an integer number (41235390).

Almost surely, 2^781312012 is an apocalyptic number.

It is an amenable number.

781312012 is a deficient number, since it is larger than the sum of its proper divisors (703162028).

781312012 is a wasteful number, since it uses less digits than its factorization.

781312012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082 (or 3067 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 781312012 is about 27951.9590011148. The cubic root of 781312012 is about 921.0322424592.

Adding to 781312012 its reverse (210213187), we get a palindrome (991525199).

The spelling of 781312012 in words is "seven hundred eighty-one million, three hundred twelve thousand, twelve".