87808772993 has 4 divisors (see below), whose sum is σ = 88061824560. Its totient is φ = 87555721428.

The previous prime is 87808772927. The next prime is 87808773001. The reversal of 87808772993 is 39927780878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39927780878 = 2 ⋅19963890439.

It is a cyclic number.

It is not a de Polignac number, because 87808772993 - 2¹⁶ = 87808707457 is a prime.

It is a super-2 number, since 2×87808772993² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87808772903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126525263 + ... + 126525956.

It is an arithmetic number, because the mean of its divisors is an integer number (22015456140).

Almost surely, 2^87808772993 is an apocalyptic number.

It is an amenable number.

87808772993 is a deficient number, since it is larger than the sum of its proper divisors (253051567).

87808772993 is a wasteful number, since it uses less digits than its factorization.

87808772993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253051566.

The product of its (nonzero) digits is 85349376, while the sum is 68.

The spelling of 87808772993 in words is "eighty-seven billion, eight hundred eight million, seven hundred seventy-two thousand, nine hundred ninety-three".