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228137631 = 3211360407
BaseRepresentation
bin11011001100100…
…01101010011111
3120220021120222220
431212101222133
5431400401011
634345440423
75440065201
oct1546215237
9526246886
10228137631
111078611a7
12644a0113
13383596a7
1422428771
1515066506
hexd991a9f

228137631 has 8 divisors (see below), whose sum is σ = 305625984. Its totient is φ = 151370520.

The previous prime is 228137627. The next prime is 228137633. The reversal of 228137631 is 136731822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228137631 - 22 = 228137627 is a prime.

It is a super-2 number, since 2×2281376312 = 104093557356584322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228137592 and 228137601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228137633) 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, 179571 + ... + 180836.

It is an arithmetic number, because the mean of its divisors is an integer number (38203248).

Almost surely, 2228137631 is an apocalyptic number.

228137631 is a deficient number, since it is larger than the sum of its proper divisors (77488353).

228137631 is a wasteful number, since it uses less digits than its factorization.

228137631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360621.

The product of its digits is 12096, while the sum is 33.

The square root of 228137631 is about 15104.2256008046. The cubic root of 228137631 is about 611.0343742017.

The spelling of 228137631 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, six hundred thirty-one".

Divisors: 1 3 211 633 360407 1081221 76045877 228137631