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228144721 = 7471933593
BaseRepresentation
bin11011001100100…
…11011001010001
3120220021221201111
431212103121101
5431401112341
634345533321
75440124650
oct1546233121
9526257644
10228144721
11107866562
12644a4241
133835c99c
142242b197
1515068681
hexd993651

228144721 has 16 divisors (see below), whose sum is σ = 267738624. Its totient is φ = 190347264.

The previous prime is 228144703. The next prime is 228144727. The reversal of 228144721 is 127441822.

228144721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-228144721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228144727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61701 + ... + 65293.

It is an arithmetic number, because the mean of its divisors is an integer number (16733664).

Almost surely, 2228144721 is an apocalyptic number.

It is an amenable number.

228144721 is a deficient number, since it is larger than the sum of its proper divisors (39593903).

228144721 is a wasteful number, since it uses less digits than its factorization.

228144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its digits is 7168, while the sum is 31.

The square root of 228144721 is about 15104.4603015136. The cubic root of 228144721 is about 611.0407039902.

The spelling of 228144721 in words is "two hundred twenty-eight million, one hundred forty-four thousand, seven hundred twenty-one".

Divisors: 1 7 47 193 329 1351 3593 9071 25151 63497 168871 693449 1182097 4854143 32592103 228144721