28515535 has 8 divisors (see below), whose sum is σ = 34729776. Its totient is φ = 22471680.

The previous prime is 28515491. The next prime is 28515559. The reversal of 28515535 is 53551582.

28515535 = T₄₂₉ + T₄₃₀ + ... + T₆₂₉.

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

It is a de Polignac number, because none of the positive numbers 2^k-28515535 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28515535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42226 + ... + 42895.

It is an arithmetic number, because the mean of its divisors is an integer number (4341222).

Almost surely, 2^28515535 is an apocalyptic number.

28515535 is a deficient number, since it is larger than the sum of its proper divisors (6214241).

28515535 is an equidigital number, since it uses as much as digits as its factorization.

28515535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85193.

The product of its digits is 30000, while the sum is 34.

The square root of 28515535 is about 5339.9939138542. The cubic root of 28515535 is about 305.5112271904.

The spelling of 28515535 in words is "twenty-eight million, five hundred fifteen thousand, five hundred thirty-five".