782788989 has 4 divisors (see below), whose sum is σ = 1043718656. Its totient is φ = 521859324.

The previous prime is 782788973. The next prime is 782788991. The reversal of 782788989 is 989887287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 782788989 - 2⁴ = 782788973 is a prime.

It is a super-2 number, since 2×782788989² = 1225517202599284242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (782788949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130464829 + ... + 130464834.

It is an arithmetic number, because the mean of its divisors is an integer number (260929664).

Almost surely, 2^782788989 is an apocalyptic number.

It is an amenable number.

782788989 is a deficient number, since it is larger than the sum of its proper divisors (260929667).

782788989 is a wasteful number, since it uses less digits than its factorization.

782788989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260929666.

The product of its digits is 32514048, while the sum is 66.

The square root of 782788989 is about 27978.3664462384. The cubic root of 782788989 is about 921.6122442714.

The spelling of 782788989 in words is "seven hundred eighty-two million, seven hundred eighty-eight thousand, nine hundred eighty-nine".