28697155 has 4 divisors (see below), whose sum is σ = 34436592. Its totient is φ = 22957720.

The previous prime is 28697147. The next prime is 28697183. The reversal of 28697155 is 55179682.

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

It is not a de Polignac number, because 28697155 - 2³ = 28697147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2869711 + ... + 2869720.

It is an arithmetic number, because the mean of its divisors is an integer number (8609148).

Almost surely, 2^28697155 is an apocalyptic number.

28697155 is a deficient number, since it is larger than the sum of its proper divisors (5739437).

28697155 is an equidigital number, since it uses as much as digits as its factorization.

28697155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739436.

The product of its digits is 151200, while the sum is 43.

The square root of 28697155 is about 5356.9725591980. The cubic root of 28697155 is about 306.1584716066.

The spelling of 28697155 in words is "twenty-eight million, six hundred ninety-seven thousand, one hundred fifty-five".