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228792909 = 376264303
BaseRepresentation
bin11011010001100…
…01101001001101
3120221111212212110
431220301221031
5432032333114
634411454233
75445464502
oct1550615115
9527455773
10228792909
11108169554
1264757379
1338528a27
14225594a9
1515145759
hexda31a4d

228792909 has 4 divisors (see below), whose sum is σ = 305057216. Its totient is φ = 152528604.

The previous prime is 228792899. The next prime is 228792911. The reversal of 228792909 is 909297822.

It is a happy number.

228792909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228792909 - 28 = 228792653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228792929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38132149 + ... + 38132154.

It is an arithmetic number, because the mean of its divisors is an integer number (76264304).

Almost surely, 2228792909 is an apocalyptic number.

It is an amenable number.

228792909 is a deficient number, since it is larger than the sum of its proper divisors (76264307).

228792909 is an equidigital number, since it uses as much as digits as its factorization.

228792909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76264306.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 228792909 is about 15125.9019235218. The cubic root of 228792909 is about 611.6188381189.

The spelling of 228792909 in words is "two hundred twenty-eight million, seven hundred ninety-two thousand, nine hundred nine".

Divisors: 1 3 76264303 228792909