87659849 has 4 divisors (see below), whose sum is σ = 87895236. Its totient is φ = 87424464.

The previous prime is 87659821. The next prime is 87659903. The reversal of 87659849 is 94895678.

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 39287824 + 48372025 = 6268^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 87659849 - 2¹² = 87655753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87659794 and 87659803.

It is not an unprimeable number, because it can be changed into a prime (87659449) 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, 117134 + ... + 117879.

It is an arithmetic number, because the mean of its divisors is an integer number (21973809).

Almost surely, 2^87659849 is an apocalyptic number.

It is an amenable number.

87659849 is a deficient number, since it is larger than the sum of its proper divisors (235387).

87659849 is a wasteful number, since it uses less digits than its factorization.

87659849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235386.

The product of its digits is 4354560, while the sum is 56.

The square root of 87659849 is about 9362.6838566727. The cubic root of 87659849 is about 444.2221803493. Note that the first 3 decimals are identical.

The spelling of 87659849 in words is "eighty-seven million, six hundred fifty-nine thousand, eight hundred forty-nine".