87709647 has 32 divisors (see below), whose sum is σ = 129719232. Its totient is φ = 52475904.

The previous prime is 87709639. The next prime is 87709663. The reversal of 87709647 is 74690778.

It is not a de Polignac number, because 87709647 - 2³ = 87709639 is a prime.

It is a super-3 number, since 3×87709647³ (a number of 25 digits) contains 333 as substring.

87709647 is a modest number, since divided by 9647 gives 8770 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 87709596 and 87709605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87709627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99573 + ... + 100449.

It is an arithmetic number, because the mean of its divisors is an integer number (4053726).

Almost surely, 2^87709647 is an apocalyptic number.

87709647 is a deficient number, since it is larger than the sum of its proper divisors (42009585).

87709647 is a wasteful number, since it uses less digits than its factorization.

87709647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987.

The product of its (nonzero) digits is 592704, while the sum is 48.

The square root of 87709647 is about 9365.3428661208. The cubic root of 87709647 is about 444.3062826637.

The spelling of 87709647 in words is "eighty-seven million, seven hundred nine thousand, six hundred forty-seven".