780789997 has 16 divisors (see below), whose sum is σ = 874344240. Its totient is φ = 692278272.

The previous prime is 780789983. The next prime is 780790007. The reversal of 780789997 is 799987087.

It can be written as a sum of positive squares in 8 ways, for example, as 46867716 + 733922281 = 6846^2 + 27091^2 .

It is a cyclic number.

It is not a de Polignac number, because 780789997 - 2⁷ = 780789869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780789697) 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 15 ways as a sum of consecutive naturals, for example, 69013 + ... + 79525.

It is an arithmetic number, because the mean of its divisors is an integer number (54646515).

Almost surely, 2^780789997 is an apocalyptic number.

It is an amenable number.

780789997 is a deficient number, since it is larger than the sum of its proper divisors (93554243).

780789997 is a wasteful number, since it uses less digits than its factorization.

780789997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10752.

The product of its (nonzero) digits is 16003008, while the sum is 64.

The square root of 780789997 is about 27942.6197232829. The cubic root of 780789997 is about 920.8270748458.

The spelling of 780789997 in words is "seven hundred eighty million, seven hundred eighty-nine thousand, nine hundred ninety-seven".