28915585 has 8 divisors (see below), whose sum is σ = 34727616. Its totient is φ = 23113200.

The previous prime is 28915583. The next prime is 28915597. The reversal of 28915585 is 58551982.

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

It is not a de Polignac number, because 28915585 - 2¹ = 28915583 is a prime.

It is a super-2 number, since 2×28915585² = 1672222111784450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28915583) 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, 10060 + ... + 12610.

It is an arithmetic number, because the mean of its divisors is an integer number (4340952).

Almost surely, 2^28915585 is an apocalyptic number.

It is an amenable number.

28915585 is a deficient number, since it is larger than the sum of its proper divisors (5812031).

28915585 is a wasteful number, since it uses less digits than its factorization.

28915585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823.

The product of its digits is 144000, while the sum is 43.

The square root of 28915585 is about 5377.3213591899. The cubic root of 28915585 is about 306.9332898373.

It can be divided in two parts, 28 and 915585, that multiplied together give a triangular number (25636380 = T₇₁₆₀).

The spelling of 28915585 in words is "twenty-eight million, nine hundred fifteen thousand, five hundred eighty-five".