878987898781 has 2 divisors, whose sum is σ = 878987898782. Its totient is φ = 878987898780.

The previous prime is 878987898731. The next prime is 878987898787. The reversal of 878987898781 is 187898789878.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 463568977881 + 415418920900 = 680859^2 + 644530^2 .

It is a cyclic number.

It is not a de Polignac number, because 878987898781 - 2¹¹ = 878987896733 is a prime.

It is a super-2 number, since 2×878987898781² (a number of 25 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 878987898692 and 878987898701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878987898787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439493949390 + 439493949391.

It is an arithmetic number, because the mean of its divisors is an integer number (439493949391).

Almost surely, 2^878987898781 is an apocalyptic number.

It is an amenable number.

878987898781 is a deficient number, since it is larger than the sum of its proper divisors (1).

878987898781 is an equidigital number, since it uses as much as digits as its factorization.

878987898781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7283146752, while the sum is 88.

The spelling of 878987898781 in words is "eight hundred seventy-eight billion, nine hundred eighty-seven million, eight hundred ninety-eight thousand, seven hundred eighty-one".