707878681 has 2 divisors, whose sum is σ = 707878682. Its totient is φ = 707878680.

The previous prime is 707878667. The next prime is 707878693. The reversal of 707878681 is 186878707.

It is a happy number.

707878681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443523600 + 264355081 = 21060^2 + 16259^2 .

It is an emirp because it is prime and its reverse (186878707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 707878681 - 2⁷ = 707878553 is a prime.

It is a super-2 number, since 2×707878681² = 1002184454028599522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (707878481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353939340 + 353939341.

It is an arithmetic number, because the mean of its divisors is an integer number (353939341).

Almost surely, 2^707878681 is an apocalyptic number.

It is an amenable number.

707878681 is a deficient number, since it is larger than the sum of its proper divisors (1).

707878681 is an equidigital number, since it uses as much as digits as its factorization.

707878681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1053696, while the sum is 52.

The square root of 707878681 is about 26605.9895700198. The cubic root of 707878681 is about 891.2227778588. Note that the first 3 decimals are identical.

The spelling of 707878681 in words is "seven hundred seven million, eight hundred seventy-eight thousand, six hundred eighty-one".