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28656235 = 567113757
BaseRepresentation
bin110110101010…
…0001001101011
31222220212222001
41231110021223
524313444420
62502111431
7465400606
oct155241153
958825861
1028656235
11151a2943
12971b577
135c2446a
143b3d33d
1527b0b0a
hex1b5426b

28656235 has 16 divisors (see below), whose sum is σ = 35256096. Its totient is φ = 22353408.

The previous prime is 28656227. The next prime is 28656247. The reversal of 28656235 is 53265682.

It is a happy number.

28656235 is a nontrivial binomial coefficient, being equal to C(7571, 2).

It is a cyclic number.

It is not a de Polignac number, because 28656235 - 23 = 28656227 is a prime.

It is a super-3 number, since 3×286562353 (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28656194 and 28656203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37477 + ... + 38233.

It is an arithmetic number, because the mean of its divisors is an integer number (2203506).

Almost surely, 228656235 is an apocalyptic number.

28656235 is the 7570-th triangular number.

28656235 is the 2524-th centered nonagonal number.

28656235 is a deficient number, since it is larger than the sum of its proper divisors (6599861).

28656235 is a wasteful number, since it uses less digits than its factorization.

28656235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942.

The product of its digits is 86400, while the sum is 37.

The square root of 28656235 is about 5353.1518752974. The cubic root of 28656235 is about 306.0128826792.

The spelling of 28656235 in words is "twenty-eight million, six hundred fifty-six thousand, two hundred thirty-five".

Divisors: 1 5 67 113 335 565 757 3785 7571 37855 50719 85541 253595 427705 5731247 28656235