782606138 has 4 divisors (see below), whose sum is σ = 1173909210. Its totient is φ = 391303068.

The previous prime is 782606089. The next prime is 782606147. The reversal of 782606138 is 831606287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 622153249 + 160452889 = 24943^2 + 12667^2 .

It is a super-2 number, since 2×782606138² = 1224944734470550088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 782606095 and 782606104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195651533 + ... + 195651536.

Almost surely, 2^782606138 is an apocalyptic number.

782606138 is a deficient number, since it is larger than the sum of its proper divisors (391303072).

782606138 is a wasteful number, since it uses less digits than its factorization.

782606138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391303071.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 782606138 is about 27975.0985342322. The cubic root of 782606138 is about 921.5404791488.

The spelling of 782606138 in words is "seven hundred eighty-two million, six hundred six thousand, one hundred thirty-eight".