28155607 has 4 divisors (see below), whose sum is σ = 29126520. Its totient is φ = 27184696.

The previous prime is 28155601. The next prime is 28155613. The reversal of 28155607 is 70655182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28155601) and next prime (28155613).

It is a cyclic number.

It is not a de Polignac number, because 28155607 - 2³ = 28155599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155601) 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 3 ways as a sum of consecutive naturals, for example, 485413 + ... + 485470.

It is an arithmetic number, because the mean of its divisors is an integer number (7281630).

Almost surely, 2^28155607 is an apocalyptic number.

28155607 is a deficient number, since it is larger than the sum of its proper divisors (970913).

28155607 is an equidigital number, since it uses as much as digits as its factorization.

28155607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970912.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28155607 is about 5306.1857298817. The cubic root of 28155607 is about 304.2203756119.

The spelling of 28155607 in words is "twenty-eight million, one hundred fifty-five thousand, six hundred seven".