781216038 has 12 divisors (see below), whose sum is σ = 1692634788. Its totient is φ = 260405340.

The previous prime is 781216031. The next prime is 781216061. The reversal of 781216038 is 830612187.

It is a super-3 number, since 3×781216038³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 781215993 and 781216011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781216031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21700428 + ... + 21700463.

It is an arithmetic number, because the mean of its divisors is an integer number (141052899).

Almost surely, 2^781216038 is an apocalyptic number.

781216038 is an abundant number, since it is smaller than the sum of its proper divisors (911418750).

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

781216038 is a wasteful number, since it uses less digits than its factorization.

781216038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43400899 (or 43400896 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 781216038 is about 27950.2421814195. The cubic root of 781216038 is about 920.9945286451.

The spelling of 781216038 in words is "seven hundred eighty-one million, two hundred sixteen thousand, thirty-eight".