28815375 has 32 divisors (see below), whose sum is σ = 49091328. Its totient is φ = 15002400.

The previous prime is 28815373. The next prime is 28815377. The reversal of 28815375 is 57351882.

It is an interprime number because it is at equal distance from previous prime (28815373) and next prime (28815377).

It is not a de Polignac number, because 28815375 - 2¹ = 28815373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15232 + ... + 17018.

It is an arithmetic number, because the mean of its divisors is an integer number (1534104).

Almost surely, 2^28815375 is an apocalyptic number.

28815375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28815375 is a deficient number, since it is larger than the sum of its proper divisors (20275953).

28815375 is a wasteful number, since it uses less digits than its factorization.

28815375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1838 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 28815375 is about 5367.9954359146. The cubic root of 28815375 is about 306.5783095848.

It can be divided in two parts, 2881 and 5375, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 28815375 in words is "twenty-eight million, eight hundred fifteen thousand, three hundred seventy-five".