780800869 has 2 divisors, whose sum is σ = 780800870. Its totient is φ = 780800868.

The previous prime is 780800863. The next prime is 780800887. The reversal of 780800869 is 968008087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780475969 + 324900 = 27937^2 + 570^2 .

It is an emirp because it is prime and its reverse (968008087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780800869 - 2⁹ = 780800357 is a prime.

It is a super-2 number, since 2×780800869² = 1219299994062310322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780800863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390400434 + 390400435.

It is an arithmetic number, because the mean of its divisors is an integer number (390400435).

Almost surely, 2^780800869 is an apocalyptic number.

It is an amenable number.

780800869 is a deficient number, since it is larger than the sum of its proper divisors (1).

780800869 is an equidigital number, since it uses as much as digits as its factorization.

780800869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 780800869 is about 27942.8142641360. The cubic root of 780800869 is about 920.8313488015.

The spelling of 780800869 in words is "seven hundred eighty million, eight hundred thousand, eight hundred sixty-nine".