228172617 has 12 divisors (see below), whose sum is σ = 340214784. Its totient is φ = 147207960.

The previous prime is 228172613. The next prime is 228172661. The reversal of 228172617 is 716271822.

228172617 is a `hidden beast` number, since 2 + 28 + 17 + 2 + 617 = 666.

228172617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228172617 - 2² = 228172613 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (228172613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408633 + ... + 409190.

It is an arithmetic number, because the mean of its divisors is an integer number (28351232).

Almost surely, 2^228172617 is an apocalyptic number.

It is an amenable number.

228172617 is a deficient number, since it is larger than the sum of its proper divisors (112042167).

228172617 is a wasteful number, since it uses less digits than its factorization.

228172617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817860 (or 817857 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 228172617 is about 15105.3837091283. The cubic root of 228172617 is about 611.0656076226.

The spelling of 228172617 in words is "two hundred twenty-eight million, one hundred seventy-two thousand, six hundred seventeen".