8781407993 has 2 divisors, whose sum is σ = 8781407994. Its totient is φ = 8781407992.

The previous prime is 8781407923. The next prime is 8781408001. The reversal of 8781407993 is 3997041878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7395484009 + 1385923984 = 85997^2 + 37228^2 .

It is a cyclic number.

It is not a de Polignac number, because 8781407993 - 2²⁶ = 8714299129 is a prime.

It is a super-2 number, since 2×8781407993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8781407923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4390703996 + 4390703997.

It is an arithmetic number, because the mean of its divisors is an integer number (4390703997).

Almost surely, 2^8781407993 is an apocalyptic number.

It is an amenable number.

8781407993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8781407993 is an equidigital number, since it uses as much as digits as its factorization.

8781407993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 8781407993 is about 93709.1670702499. The cubic root of 8781407993 is about 2063.1052543251.

The spelling of 8781407993 in words is "eight billion, seven hundred eighty-one million, four hundred seven thousand, nine hundred ninety-three".