782138631 has 16 divisors (see below), whose sum is σ = 1068802560. Its totient is φ = 508609920.

The previous prime is 782138579. The next prime is 782138639. The reversal of 782138631 is 136831287.

It is not a de Polignac number, because 782138631 - 2²³ = 773750023 is a prime.

It is a super-2 number, since 2×782138631² = 1223481676205108322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 782138631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (782138639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210 + ... + 39551.

It is an arithmetic number, because the mean of its divisors is an integer number (66800160).

Almost surely, 2^782138631 is an apocalyptic number.

782138631 is a deficient number, since it is larger than the sum of its proper divisors (286663929).

782138631 is a wasteful number, since it uses less digits than its factorization.

782138631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39926.

The product of its digits is 48384, while the sum is 39.

The square root of 782138631 is about 27966.7415155931. The cubic root of 782138631 is about 921.3569417684.

The spelling of 782138631 in words is "seven hundred eighty-two million, one hundred thirty-eight thousand, six hundred thirty-one".