787860845561881 has 81 divisors (see below), whose sum is σ = 998932555450719. Its totient is φ = 619294239109728.

The previous prime is 787860845561863. The next prime is 787860845561899. The reversal of 787860845561881 is 188165548068787.

The square root of 787860845561881 is 28068859.

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

It is an interprime number because it is at equal distance from previous prime (787860845561863) and next prime (787860845561899).

It can be written as a sum of positive squares in only one way, i.e., 116547462361225 + 671313383200656 = 10795715^2 + 25909716^2 .

It is not a de Polignac number, because 787860845561881 - 2¹³ = 787860845553689 is a prime.

It is a super-2 number, since 2×787860845561881² (a number of 31 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 = 787860845561795 and 787860845561804.

It is not an unprimeable number, because it can be changed into a prime (787860845561081) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 426562449300 + ... + 426562451146.

Almost surely, 2^{787860845561881} is an apocalyptic number.

787860845561881 is the 28068859-th square number.

787860845561881 is the 14034430-th centered octagonal number.

It is an amenable number.

787860845561881 is a deficient number, since it is larger than the sum of its proper divisors (211071709888838).

787860845561881 is an frugal number, since it uses more digits than its factorization.

787860845561881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 5780275200, while the sum is 82.

The spelling of 787860845561881 in words is "seven hundred eighty-seven trillion, eight hundred sixty billion, eight hundred forty-five million, five hundred sixty-one thousand, eight hundred eighty-one".