87978849 has 16 divisors (see below), whose sum is σ = 134220672. Its totient is φ = 50214528.

The previous prime is 87978833. The next prime is 87978881. The reversal of 87978849 is 94887978.

It is not a de Polignac number, because 87978849 - 2⁴ = 87978833 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87978792 and 87978801.

It is not an unprimeable number, because it can be changed into a prime (87978829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21037 + ... + 24869.

It is an arithmetic number, because the mean of its divisors is an integer number (8388792).

Almost surely, 2^87978849 is an apocalyptic number.

It is an amenable number.

87978849 is a deficient number, since it is larger than the sum of its proper divisors (46241823).

87978849 is a wasteful number, since it uses less digits than its factorization.

87978849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936.

The product of its digits is 8128512, while the sum is 60.

The square root of 87978849 is about 9379.7040998104. The cubic root of 87978849 is about 444.7603793471.

The spelling of 87978849 in words is "eighty-seven million, nine hundred seventy-eight thousand, eight hundred forty-nine".