28900155 has 16 divisors (see below), whose sum is σ = 46444320. Its totient is φ = 15345408.

The previous prime is 28900139. The next prime is 28900177. The reversal of 28900155 is 55100982.

It is not a de Polignac number, because 28900155 - 2⁴ = 28900139 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 640 + ... + 7629.

It is an arithmetic number, because the mean of its divisors is an integer number (2902770).

Almost surely, 2^28900155 is an apocalyptic number.

28900155 is a deficient number, since it is larger than the sum of its proper divisors (17544165).

28900155 is a wasteful number, since it uses less digits than its factorization.

28900155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 28900155 is about 5375.8864385327. The cubic root of 28900155 is about 306.8786846440.

The spelling of 28900155 in words is "twenty-eight million, nine hundred thousand, one hundred fifty-five".