87885649 has 4 divisors (see below), whose sum is σ = 89089636. Its totient is φ = 86681664.

The previous prime is 87885647. The next prime is 87885653. The reversal of 87885649 is 94658878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94658878 = 2 ⋅47329439.

It can be written as a sum of positive squares in 2 ways, for example, as 70812225 + 17073424 = 8415^2 + 4132^2 .

It is a cyclic number.

It is not a de Polignac number, because 87885649 - 2¹ = 87885647 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 87885649.

It is not an unprimeable number, because it can be changed into a prime (87885647) 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, 601884 + ... + 602029.

It is an arithmetic number, because the mean of its divisors is an integer number (22272409).

Almost surely, 2^87885649 is an apocalyptic number.

It is an amenable number.

87885649 is a deficient number, since it is larger than the sum of its proper divisors (1203987).

87885649 is a wasteful number, since it uses less digits than its factorization.

87885649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203986.

The product of its digits is 3870720, while the sum is 55.

The square root of 87885649 is about 9374.7346095770. The cubic root of 87885649 is about 444.6032722179.

The spelling of 87885649 in words is "eighty-seven million, eight hundred eighty-five thousand, six hundred forty-nine".