87728849 has 4 divisors (see below), whose sum is σ = 94477236. Its totient is φ = 80980464.

The previous prime is 87728843. The next prime is 87728867. The reversal of 87728849 is 94882778.

It is a happy number.

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 36820624 + 50908225 = 6068^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 87728849 - 2¹⁶ = 87663313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87728849.

It is not an unprimeable number, because it can be changed into a prime (87728843) by changing a digit.

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, 3374174 + ... + 3374199.

It is an arithmetic number, because the mean of its divisors is an integer number (23619309).

Almost surely, 2^87728849 is an apocalyptic number.

It is an amenable number.

87728849 is a deficient number, since it is larger than the sum of its proper divisors (6748387).

87728849 is a wasteful number, since it uses less digits than its factorization.

87728849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6748386.

The product of its digits is 1806336, while the sum is 53.

The square root of 87728849 is about 9366.3679726989. The cubic root of 87728849 is about 444.3387038284.

The spelling of 87728849 in words is "eighty-seven million, seven hundred twenty-eight thousand, eight hundred forty-nine".