782531138 has 16 divisors (see below), whose sum is σ = 1189611360. Its totient is φ = 386007456.

The previous prime is 782531137. The next prime is 782531147. The reversal of 782531138 is 831135287.

It is a happy number.

It is a super-2 number, since 2×782531138² = 1224709963879150088, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (782531137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131381 + ... + 137207.

It is an arithmetic number, because the mean of its divisors is an integer number (74350710).

Almost surely, 2^782531138 is an apocalyptic number.

782531138 is a deficient number, since it is larger than the sum of its proper divisors (407080222).

782531138 is a wasteful number, since it uses less digits than its factorization.

782531138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721.

The product of its digits is 40320, while the sum is 38.

The square root of 782531138 is about 27973.7580242627. The cubic root of 782531138 is about 921.5110400135.

The spelling of 782531138 in words is "seven hundred eighty-two million, five hundred thirty-one thousand, one hundred thirty-eight".