781423312 has 20 divisors (see below), whose sum is σ = 1514491236. Its totient is φ = 390586880.

The previous prime is 781423303. The next prime is 781423319. The reversal of 781423312 is 213324187.

It can be written as a sum of positive squares in 2 ways, for example, as 395850816 + 385572496 = 19896^2 + 19636^2 .

It is a super-2 number, since 2×781423312² = 1221244785074098688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781423319) 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, 63762 + ... + 75022.

Almost surely, 2^781423312 is an apocalyptic number.

It is an amenable number.

781423312 is a deficient number, since it is larger than the sum of its proper divisors (733067924).

781423312 is a wasteful number, since it uses less digits than its factorization.

781423312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606 (or 15600 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 781423312 is about 27953.9498461309. The cubic root of 781423312 is about 921.0759748904.

Adding to 781423312 its reverse (213324187), we get a palindrome (994747499).

The spelling of 781423312 in words is "seven hundred eighty-one million, four hundred twenty-three thousand, three hundred twelve".