878694387769 has 45 divisors (see below), whose sum is σ = 990461220255. Its totient is φ = 779531029200.

The previous prime is 878694387763. The next prime is 878694387773. The reversal of 878694387769 is 967783496878.

The square root of 878694387769 is 937387.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 28573507369 + 850120880400 = 169037^2 + 922020^2 .

It is not a de Polignac number, because 878694387769 - 2⁹ = 878694387257 is a prime.

It is a super-2 number, since 2×878694387769² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 878694387692 and 878694387701.

It is not an unprimeable number, because it can be changed into a prime (878694387763) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6918853384 + ... + 6918853510.

It is an arithmetic number, because the mean of its divisors is an integer number (22010249339).

Almost surely, 2^878694387769 is an apocalyptic number.

878694387769 is the 937387-th square number.

878694387769 is the 468694-th centered octagonal number.

It is an amenable number.

878694387769 is a deficient number, since it is larger than the sum of its proper divisors (111766832486).

878694387769 is an frugal number, since it uses more digits than its factorization.

878694387769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 199 counting only the distinct ones).

The product of its digits is 6145155072, while the sum is 82.

The spelling of 878694387769 in words is "eight hundred seventy-eight billion, six hundred ninety-four million, three hundred eighty-seven thousand, seven hundred sixty-nine".