87747474769 has 2 divisors, whose sum is σ = 87747474770. Its totient is φ = 87747474768.

The previous prime is 87747474701. The next prime is 87747474799. The reversal of 87747474769 is 96747474778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72374450625 + 15373024144 = 269025^2 + 123988^2 .

It is a cyclic number.

It is not a de Polignac number, because 87747474769 - 2³¹ = 85599991121 is a prime.

It is a super-2 number, since 2×87747474769² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87747474698 and 87747474707.

It is not a weakly prime, because it can be changed into another prime (87747474799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43873737384 + 43873737385.

It is an arithmetic number, because the mean of its divisors is an integer number (43873737385).

Almost surely, 2^87747474769 is an apocalyptic number.

It is an amenable number.

87747474769 is a deficient number, since it is larger than the sum of its proper divisors (1).

87747474769 is an equidigital number, since it uses as much as digits as its factorization.

87747474769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 464679936, while the sum is 70.

Subtracting 87747474769 from its reverse (96747474778), we obtain a palindrome (9000000009).

The spelling of 87747474769 in words is "eighty-seven billion, seven hundred forty-seven million, four hundred seventy-four thousand, seven hundred sixty-nine".