87538817 has 4 divisors (see below), whose sum is σ = 87992580. Its totient is φ = 87085056.

The previous prime is 87538793. The next prime is 87538819. The reversal of 87538817 is 71883578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31348801 + 56190016 = 5599^2 + 7496^2 .

It is a cyclic number.

It is not a de Polignac number, because 87538817 - 2¹² = 87534721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87538819) 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, 226592 + ... + 226977.

It is an arithmetic number, because the mean of its divisors is an integer number (21998145).

Almost surely, 2^87538817 is an apocalyptic number.

It is an amenable number.

87538817 is a deficient number, since it is larger than the sum of its proper divisors (453763).

87538817 is a wasteful number, since it uses less digits than its factorization.

87538817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453762.

The product of its digits is 376320, while the sum is 47.

The square root of 87538817 is about 9356.2180927980. The cubic root of 87538817 is about 444.0176402509.

The spelling of 87538817 in words is "eighty-seven million, five hundred thirty-eight thousand, eight hundred seventeen".