787849736881 has 9 divisors (see below), whose sum is σ = 807571566273. Its totient is φ = 768598385280.

The previous prime is 787849736831. The next prime is 787849736911. The reversal of 787849736881 is 188637948787.

The square root of 787849736881 is 887609.

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

It can be written as a sum of positive squares in 4 ways, for example, as 322179976881 + 465669760000 = 567609^2 + 682400^2 .

It is not a de Polignac number, because 787849736881 - 2⁹ = 787849736369 is a prime.

It is a super-2 number, since 2×787849736881² (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 = 787849736798 and 787849736807.

It is not an unprimeable number, because it can be changed into a prime (787849736801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 36381145 + ... + 36402793.

Almost surely, 2^787849736881 is an apocalyptic number.

787849736881 is the 887609-th square number.

787849736881 is the 443805-th centered octagonal number.

It is an amenable number.

787849736881 is a deficient number, since it is larger than the sum of its proper divisors (19721829392).

787849736881 is an frugal number, since it uses more digits than its factorization.

787849736881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43380 (or 21690 counting only the distinct ones).

The product of its digits is 910393344, while the sum is 76.

The spelling of 787849736881 in words is "seven hundred eighty-seven billion, eight hundred forty-nine million, seven hundred thirty-six thousand, eight hundred eighty-one".