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28436331 = 3711219231
BaseRepresentation
bin110110001111…
…0011101101011
31222111201022110
41230132131223
524234430311
62453253403
7463463520
oct154363553
958451273
1028436331
1115062700
129634263
135b78341
143ac3147
15276a8a6
hex1b1e76b

28436331 has 72 divisors (see below), whose sum is σ = 51889152. Its totient is φ = 13543200.

The previous prime is 28436263. The next prime is 28436377. The reversal of 28436331 is 13363482.

It is not a de Polignac number, because 28436331 - 29 = 28435819 is a prime.

It is a super-2 number, since 2×284363312 = 1617249841483122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28436231) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 917286 + ... + 917316.

Almost surely, 228436331 is an apocalyptic number.

28436331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28436331 is a deficient number, since it is larger than the sum of its proper divisors (23452821).

28436331 is a wasteful number, since it uses less digits than its factorization.

28436331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 71 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 28436331 is about 5332.5726436683. The cubic root of 28436331 is about 305.2281049144.

The spelling of 28436331 in words is "twenty-eight million, four hundred thirty-six thousand, three hundred thirty-one".

Divisors: 1 3 7 11 19 21 31 33 57 77 93 121 133 209 217 231 341 361 363 399 589 627 651 847 1023 1083 1463 1767 2299 2387 2527 2541 3751 3971 4123 4389 6479 6897 7161 7581 11191 11253 11913 12369 16093 19437 26257 27797 33573 43681 45353 48279 71269 78337 78771 83391 123101 131043 136059 213807 235011 305767 369303 498883 861707 917301 1354111 1496649 2585121 4062333 9478777 28436331