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381587228 = 221171122147
BaseRepresentation
bin10110101111101…
…000111100011100
3222121000122021022
4112233220330130
51240141242403
6101510423312
712312303131
oct2657507434
9877018238
10381587228
1118643a150
12a7961b38
1361095779
1438970588
1523777d38
hex16be8f1c

381587228 has 24 divisors (see below), whose sum is σ = 738751104. Its totient is φ = 171004400.

The previous prime is 381587221. The next prime is 381587237. The reversal of 381587228 is 822785183.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381587221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57950 + ... + 64197.

It is an arithmetic number, because the mean of its divisors is an integer number (30781296).

Almost surely, 2381587228 is an apocalyptic number.

381587228 is the 10442-nd centered heptagonal number.

It is an amenable number.

381587228 is a deficient number, since it is larger than the sum of its proper divisors (357163876).

381587228 is a wasteful number, since it uses less digits than its factorization.

381587228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122233 (or 122231 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The square root of 381587228 is about 19534.2578051996. The cubic root of 381587228 is about 725.3227119812.

The spelling of 381587228 in words is "three hundred eighty-one million, five hundred eighty-seven thousand, two hundred twenty-eight".

Divisors: 1 2 4 11 22 44 71 142 284 781 1562 3124 122147 244294 488588 1343617 2687234 5374468 8672437 17344874 34689748 95396807 190793614 381587228