87818449 has 4 divisors (see below), whose sum is σ = 87854436. Its totient is φ = 87782464.

The previous prime is 87818417. The next prime is 87818459. The reversal of 87818449 is 94481878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94481878 = 2 ⋅47240939.

It can be written as a sum of positive squares in 2 ways, for example, as 11343424 + 76475025 = 3368^2 + 8745^2 .

It is a cyclic number.

It is not a de Polignac number, because 87818449 - 2⁵ = 87818417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87818459) 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, 14044 + ... + 19309.

It is an arithmetic number, because the mean of its divisors is an integer number (21963609).

Almost surely, 2^87818449 is an apocalyptic number.

It is an amenable number.

87818449 is a deficient number, since it is larger than the sum of its proper divisors (35987).

87818449 is a wasteful number, since it uses less digits than its factorization.

87818449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35986.

The product of its digits is 516096, while the sum is 49.

The square root of 87818449 is about 9371.1498227272. The cubic root of 87818449 is about 444.4899243297.

The spelling of 87818449 in words is "eighty-seven million, eight hundred eighteen thousand, four hundred forty-nine".