87728969 has 8 divisors (see below), whose sum is σ = 91640832. Its totient is φ = 83825280.

The previous prime is 87728899. The next prime is 87728981. The reversal of 87728969 is 96982778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87728969 - 2²⁴ = 70951753 is a prime.

It is a super-2 number, since 2×87728969² = 15392744003605922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87728999) 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 7 ways as a sum of consecutive naturals, for example, 32537 + ... + 35129.

It is an arithmetic number, because the mean of its divisors is an integer number (11455104).

Almost surely, 2^87728969 is an apocalyptic number.

It is an amenable number.

87728969 is a deficient number, since it is larger than the sum of its proper divisors (3911863).

87728969 is a wasteful number, since it uses less digits than its factorization.

87728969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087.

The product of its digits is 3048192, while the sum is 56.

The square root of 87728969 is about 9366.3743785950. The cubic root of 87728969 is about 444.3389064247.

The spelling of 87728969 in words is "eighty-seven million, seven hundred twenty-eight thousand, nine hundred sixty-nine".