28908211 has 8 divisors (see below), whose sum is σ = 31436640. Its totient is φ = 26471808.

The previous prime is 28908199. The next prime is 28908221. The reversal of 28908211 is 11280982.

It is a happy number.

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 28908211 - 2¹⁷ = 28777139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28908221) 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, 22351 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (3929580).

Almost surely, 2^28908211 is an apocalyptic number.

28908211 is a deficient number, since it is larger than the sum of its proper divisors (2528429).

28908211 is a wasteful number, since it uses less digits than its factorization.

28908211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46013.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28908211 is about 5376.6356581044. The cubic root of 28908211 is about 306.9071964289.

The spelling of 28908211 in words is "twenty-eight million, nine hundred eight thousand, two hundred eleven".