28505149 has 8 divisors (see below), whose sum is σ = 30572640. Its totient is φ = 26494416.

The previous prime is 28505093. The next prime is 28505153. The reversal of 28505149 is 94150582.

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

It is a cyclic number.

It is not a de Polignac number, because 28505149 - 2⁷ = 28505021 is a prime.

It is a Duffinian number.

28505149 is a modest number, since divided by 5149 gives 285 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13147 + ... + 15160.

It is an arithmetic number, because the mean of its divisors is an integer number (3821580).

Almost surely, 2^28505149 is an apocalyptic number.

It is an amenable number.

28505149 is a deficient number, since it is larger than the sum of its proper divisors (2067491).

28505149 is a wasteful number, since it uses less digits than its factorization.

28505149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28379.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 28505149 is about 5339.0213522705. The cubic root of 28505149 is about 305.4741313301.

The spelling of 28505149 in words is "twenty-eight million, five hundred five thousand, one hundred forty-nine".