870880781 has 2 divisors, whose sum is σ = 870880782. Its totient is φ = 870880780.

The previous prime is 870880771. The next prime is 870880793. The reversal of 870880781 is 187088078.

870880781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471280681 + 399600100 = 21709^2 + 19990^2 .

It is a cyclic number.

It is not a de Polignac number, because 870880781 - 2²² = 866686477 is a prime.

It is a super-2 number, since 2×870880781² = 1516866669430339922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870880741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435440390 + 435440391.

It is an arithmetic number, because the mean of its divisors is an integer number (435440391).

Almost surely, 2^870880781 is an apocalyptic number.

It is an amenable number.

870880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

870880781 is an equidigital number, since it uses as much as digits as its factorization.

870880781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200704, while the sum is 47.

The square root of 870880781 is about 29510.6892667725. The cubic root of 870880781 is about 954.9623189906.

The spelling of 870880781 in words is "eight hundred seventy million, eight hundred eighty thousand, seven hundred eighty-one".