87312845 has 4 divisors (see below), whose sum is σ = 104775420. Its totient is φ = 69850272.

The previous prime is 87312839. The next prime is 87312851. The reversal of 87312845 is 54821378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54821378 = 2 ⋅27410689.

It is an interprime number because it is at equal distance from previous prime (87312839) and next prime (87312851).

It can be written as a sum of positive squares in 2 ways, for example, as 29278921 + 58033924 = 5411^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 87312845 - 2⁴ = 87312829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87312799 and 87312808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8731280 + ... + 8731289.

It is an arithmetic number, because the mean of its divisors is an integer number (26193855).

Almost surely, 2^87312845 is an apocalyptic number.

It is an amenable number.

87312845 is a deficient number, since it is larger than the sum of its proper divisors (17462575).

87312845 is a wasteful number, since it uses less digits than its factorization.

87312845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17462574.

The product of its digits is 53760, while the sum is 38.

The square root of 87312845 is about 9344.1342563129. The cubic root of 87312845 is about 443.6352498371.

The spelling of 87312845 in words is "eighty-seven million, three hundred twelve thousand, eight hundred forty-five".